Method and apparatus for transmitting/receiving wireless signal in wireless communication system

ABSTRACT

The disclosure relates to a wireless communication system. Particularly, the disclosure relates to a method including determining a first uplink control information (UCI) of a highest priority among a plurality of UCIs, the plurality of UCIs corresponding to a plurality of non-overlapped physical uplink control channel (PUCCH) resources within the same time period, determining a second UCI of a highest priority in a UCI set, based on a format of a PUCCH resource corresponding to the first UCI, and transmitting the first UCI and the second UCI, respectively in PUCCH resources corresponding to the first UCI and the second UCI, and an apparatus for the same.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/577,424, filed on Sep. 20, 2019, now allowed, which is a continuationof the PCT International Application No. PCT/KR2019/005677 filed on May10, 2019, which claims priority under 35 U.S.C. 119(e) to U.S.Provisional Applications No. 62/669,956, filed on May 10, 2018; No.62/673,996, filed on May 20, 2018; No. 62/674,589, filed on May 21,2018; and No. 62/675,133, filed on May 22, 2018 and claims priorityunder 35 U.S.C. 119(a) to Korean Patent Application No. 10-2018-0115391,filed on Sep. 27, 2018, all of which are incorporated by reference intheir entirety.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system, andmore particularly, to a method and apparatus for transmitting/receivinga wireless signal.

BACKGROUND

Generally, a wireless communication system is developing to diverselycover a wide range to provide such a communication service as an audiocommunication service, a data communication service and the like. Thewireless communication is a sort of a multiple access system capable ofsupporting communications with multiple users by sharing availablesystem resources (e.g., bandwidth, transmit power, etc.). For example,the multiple access system may include one of code division multipleaccess (CDMA) system, frequency division multiple access (FDMA) system,time division multiple access (TDMA) system, orthogonal frequencydivision multiple access (OFDMA) system, single carrier frequencydivision multiple access (SC-FDMA) system and the like.

SUMMARY

An aspect of the present disclosure is to provide a method ofefficiently transmitting/receiving a wireless signal in a wirelesscommunication and an apparatus therefor.

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present disclosure are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present disclosure could achieve will be more clearlyunderstood from the following detailed description.

In an aspect of the present disclosure, a method of transmitting controlinformation by a communication device in a wireless communication systemincludes determining a first Uplink Control Information (UCI) with ahighest priority among a plurality of UCIs, wherein the plurality ofUCIs corresponds to a plurality of non-overlapped Physical UplinkControl Channel (PUCCH) resources in a same time interval; determining asecond UCI with a highest priority among a set of UCIs, based on aformat of a PUCCH resource corresponding to the first UCI; andtransmitting the first and second UCIs using corresponding PUCCHresources, respectively, wherein in case that the PUCCH resourcecorresponding to the first UCI is of a first format, the set of UCIsincludes the plurality of UCIs except the first UCI, wherein in casethat the PUCCH resource corresponding to the first UCI is of a secondformat, the set of UCIs includes one or more UCIs corresponding to PUCCHresources of the first format only, among the plurality of UCIs, andwherein a PUCCH resource of the first format has a duration of shorterthan a value, and a PUCCH resource of the second format has a durationof equal to or larger than the value.

In another aspect of the present disclosure, a communication device usedin a wireless communication system includes a memory and a processor.The processor is configured to determine a first Uplink ControlInformation (UCI) with a highest priority among a plurality of UCIs,wherein the plurality of UCIs corresponds to a plurality ofnon-overlapped Physical Uplink Control Channel (PUCCH) resources in asame time interval, determine a second UCI with a highest priority amonga set of UCIs, based on a format of a PUCCH resource corresponding tothe first UCI, and transmit the first and second UCIs usingcorresponding PUCCH resources, respectively, wherein in case that thePUCCH resource corresponding to the first UCI is of a first format, theset of UCIs includes the plurality of UCIs except the first UCI, whereinin case that the PUCCH resource corresponding to the first UCI is of asecond format, the set of UCIs includes one or more UCIs correspondingto PUCCH resources of the first format only, among the plurality ofUCIs, and wherein a PUCCH resource of the first format has a duration ofshorter than a value, and a PUCCH resource of the second format has aduration of equal to or larger than the value.

In another aspect of the present disclosure, a method of receivingcontrol information by a communication device in a wirelesscommunication system includes determining a first Uplink ControlInformation (UCI) with a highest priority among a plurality of UCIs,wherein the plurality of UCIs corresponds to a plurality ofnon-overlapped Physical Uplink Control Channel (PUCCH) resources in asame time interval; determining a second UCI with a highest priorityamong a set of UCIs, based on a format of a PUCCH resource correspondingto the first UCI; and receiving the first and second UCIs usingcorresponding PUCCH resources, respectively, wherein in case that thePUCCH resource corresponding to the first UCI is of a first format, theset of UCIs includes the plurality of UCIs except the first UCI, whereinin case that the PUCCH resource corresponding to the first UCI is of asecond format, the set of UCIs includes one or more UCIs correspondingto PUCCH resources of the first format only, among the plurality ofUCIs, and wherein a PUCCH resource of the first format has a duration ofshorter than a value, and a PUCCH resource of the second format has aduration of equal to or larger than the value.

In another aspect of the present disclosure, a communication device usedin a wireless communication system includes a memory and a processor.The processor is configured to: determine a first Uplink ControlInformation (UCI) with a highest priority among a plurality of UCIs,wherein the plurality of UCIs corresponds to a plurality ofnon-overlapped Physical Uplink Control Channel (PUCCH) resources in asame time interval, determine a second UCI with a highest priority amonga set of UCIs, based on a format of a PUCCH resource corresponding tothe first UCI, and receive the first and second UCIs using correspondingPUCCH resources, respectively, wherein in case that the PUCCH resourcecorresponding to the first UCI is of a first format, the set of UCIsincludes the plurality of UCIs except the first UCI, wherein in casethat the PUCCH resource corresponding to the first UCI is of a secondformat, the set of UCIs includes one or more UCIs corresponding to PUCCHresources of the first format only, among the plurality of UCIs, andwherein a PUCCH resource of the first format has a duration of shorterthan a value, and a PUCCH resource of the second format has a durationof equal to or larger than the value.

The PUCCH resource of the first format may have one to two symbolduration, and the PUCCH resource of the second format may have four ormore symbol duration.

The plurality of UCIs may be of a same UCI type. Herein, the same UCItype may be Acknowledgement/Negative acknowledgement (A/N), ChannelState Information (CSI), or Scheduling Request (SR).

The communication device may include a device used for a self-drivingvehicle.

According to the present disclosure, wireless signal transmission andreception can be efficiently performed in a wireless communicationsystem.

It will be appreciated by persons skilled in the art that the effectsthat can be achieved with the present disclosure are not limited to whathas been particularly described hereinabove and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiments of the disclosure andtogether with the description serve to explain the principle of thedisclosure. In the drawings:

FIG. 1 illustrates exemplary 5^(th) generation (5G) usage scenarios;

FIG. 2 illustrates physical channels used in a 3^(rd) generationpartnership project (3GPP) system, which is an example of wirelesscommunication systems, and a general signal transmission method usingthe same;

FIG. 3 illustrates a radio frame structure;

FIG. 4 illustrates a resource grid of a slot;

FIG. 5 illustrates a structure of a self-contained slot;

FIG. 6 illustrates an example in which a physical channel is mapped to aself-contained slot.

FIG. 7 illustrates an acknowledgement/negative acknowledgement(ACK/NACK) transmission procedure;

FIG. 8 illustrates an exemplary physical uplink shared channel (PUSCH)transmission procedure;

FIG. 9 illustrates exemplary multiplexing control information in aPUSCH;

FIGS. 10 to 13 illustrate exemplary signal transmissions according tothe present disclosure; and

FIG. 14 illustrates a base station (BS) and a user equipment (UE)applicable to the present disclosure.

DETAILED DESCRIPTION

Embodiments of the present disclosure are applicable to a variety ofwireless access technologies such as code division multiple access(CDMA), frequency division multiple access (FDMA), time divisionmultiple access (TDMA), orthogonal frequency division multiple access(OFDMA), and single carrier frequency division multiple access(SC-FDMA). CDMA can be implemented as a radio technology such asuniversal terrestrial radio access (UTRA) or CDMA2000. TDMA can beimplemented as a radio technology such as global system for mobilecommunications (GSM)/general packet radio service (GPRS)/enhanced datarates for GSM evolution (EDGE). OFDMA can be implemented as a radiotechnology such as institute of electrical and electronics engineers(IEEE) 802.11 (wireless fidelity (Wi-Fi)), IEEE 802.16 (worldwideinteroperability for microwave access (WiMAX)), IEEE 802.20, and evolvedUTRA (E-UTRA). UTRA is a part of universal mobile telecommunicationssystem (UMTS). 3rd generation partnership project (3GPP) long termevolution (LTE) is part of evolved UMTS (E-UMTS) using E-UTRA, andLTE-advanced (A) is an evolved version of 3GPP LTE. 3GPP new radio ornew radio access technology (NR) is an evolved version of 3GPPLTE/LTE-A.

As more and more communication devices require a larger communicationcapacity, there is a need for mobile broadband communication enhancedover conventional radio access technology (RAT). In addition, massivemachine type communications (MTC) capable of providing a variety ofservices anywhere and anytime by connecting multiple devices and objectsis another important issue to be considered for next generationcommunications. Communication system design considering services/UEssensitive to reliability and latency is also under discussion. As such,introduction of new radio access technology considering enhanced mobilebroadband communication (eMBB), massive MTC, and Ultra-Reliable and LowLatency Communication (URLLC) is being discussed. In the presentdisclosure, for simplicity, this technology will be referred to as NR(New Radio or New RAT).

For the sake of clarity, 3GPP NR is mainly described, but the technicalidea of the present disclosure is not limited thereto.

FIG. 1 illustrates exemplary 5^(th) generation (5G) usage scenarios.

Referring to FIG. 1, three key requirement areas of 5G (e.g., NR)include (1) enhanced mobile broadband (eMBB), (2) massive machine typecommunication (mMTC), and (3) ultra-reliable and low latencycommunications (URLLC).

Some use cases may require multiple dimensions for optimization, whileothers may focus only on one key performance indicator (KPI). 5Gsupports such diverse use cases in a flexible and reliable way.

eMBB goes far beyond basic mobile Internet access and covers richinteractive work, media and entertainment applications in the cloud oraugmented reality (AR). Data is one of the key drivers for 5G and in the5G era, we may for the first time see no dedicated voice service. In 5G,voice is expected to be handled as an application program, simply usingdata connectivity provided by a communication system. The main driversfor an increased traffic volume are the increase in the size of contentand the number of applications requiring high data rates. Streamingservices (audio and video), interactive video, and mobile Internetconnectivity will continue to be used more broadly as more devicesconnect to the Internet. Many of these applications require always-onconnectivity to push real time information and notifications to users.Cloud storage and applications are rapidly increasing for mobilecommunication platforms. This is applicable for both work andentertainment. Cloud storage is one particular use case driving thegrowth of uplink data rates. 5G will also be used for remote work in thecloud which, when done with tactile interfaces, requires much lowerend-to-end latencies in order to maintain a good user experience.Entertainment, for example, cloud gaming and video streaming, is anotherkey driver for the increasing need for mobile broadband capacity.Entertainment will be very essential on smart phones and tabletseverywhere, including high mobility environments such as trains, carsand airplanes. Another use case is augmented reality (AR) forentertainment and information search, which requires very low latenciesand significant instant data volumes.

One of the most expected 5G use cases is the functionality of activelyconnecting embedded sensors in every field, that is, mMTC. It isexpected that there will be 20.4 billion potential Internet of things(IoT) devices by 2020. In industrial IoT, 5G is one of areas that playkey roles in enabling smart city, asset tracking, smart utility,agriculture, and security infrastructure.

URLLC includes services which will transform industries withultra-reliable/available, low latency links such as remote control ofcritical infrastructure and self-driving vehicles. The level ofreliability and latency are vital to smart-grid control, industrialautomation, robotics, drone control and coordination, and so on.

Now, multiple use cases included in a triangle in FIG. 1 will bedescribed in detail.

5G may complement fiber-to-the home (FTTH) and cable-based broadband (ordata-over-cable service interface specifications (DOCSIS)) as a means ofproviding streams at data rates of hundreds of megabits per second togiga bits per second. Such a high speed is required for TV broadcasts ator above a resolution of 4K (6K, 8K, and higher) as well as virtualreality (VR) and AR. VR and AR applications mostly include immersivesport games. A special network configuration may be required for aspecific application program. For VR games, for example, game companiesmay have to integrate a core server with an edge network server of anetwork operator in order to minimize latency.

The automotive sector is expected to be a very important new driver for5G, with many use cases for mobile communications for vehicles. Forexample, entertainment for passengers requires simultaneous highcapacity and high mobility mobile broadband, because future users willexpect to continue their good quality connection independent of theirlocation and speed. Other use cases for the automotive sector are ARdashboards. These display overlay information on top of what a driver isseeing through the front window, identifying objects in the dark andtelling the driver about the distances and movements of the objects. Inthe future, wireless modules will enable communication between vehiclesthemselves, information exchange between vehicles and supportinginfrastructure and between vehicles and other connected devices (e.g.,those carried by pedestrians). Safety systems may guide drivers onalternative courses of action to allow them to drive more safely andlower the risks of accidents. The next stage will be remote-controlledor self-driving vehicles. These require very reliable, very fastcommunication between different self-driving vehicles and betweenvehicles and infrastructure. In the future, self-driving vehicles willexecute all driving activities, while drivers are focusing on trafficabnormality elusive to the vehicles themselves. The technicalrequirements for self-driving vehicles call for ultra-low latencies andultra-high reliability, increasing traffic safety to levels humanscannot achieve.

Smart cities and smart homes, often referred to as smart society, willbe embedded with dense wireless sensor networks. Distributed networks ofintelligent sensors will identify conditions for cost- andenergy-efficient maintenance of the city or home. A similar setup can bedone for each home, where temperature sensors, window and heatingcontrollers, burglar alarms, and home appliances are all connectedwirelessly. Many of these sensors are typically characterized by lowdata rate, low power, and low cost, but for example, real time highdefinition (HD) video may be required in some types of devices forsurveillance.

The consumption and distribution of energy, including heat or gas, isbecoming highly decentralized, creating the need for automated controlof a very distributed sensor network. A smart grid interconnects suchsensors, using digital information and communications technology togather and act on information. This information may include informationabout the behaviors of suppliers and consumers, allowing the smart gridto improve the efficiency, reliability, economics and sustainability ofthe production and distribution of fuels such as electricity in anautomated fashion. A smart grid may be seen as another sensor networkwith low delays.

The health sector has many applications that may benefit from mobilecommunications. Communications systems enable telemedicine, whichprovides clinical health care at a distance. It helps eliminate distancebarriers and may improve access to medical services that would often notbe consistently available in distant rural communities. It is also usedto save lives in critical care and emergency situations. Wireless sensornetworks based on mobile communication may provide remote monitoring andsensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly importantfor industrial applications. Wires are expensive to install andmaintain, and the possibility of replacing cables with reconfigurablewireless links is a tempting opportunity for many industries. However,achieving this requires that the wireless connection works with asimilar delay, reliability and capacity as cables and that itsmanagement is simplified. Low delays and very low error probabilitiesare new requirements that need to be addressed with 5G.

Finally, logistics and freight tracking are important use cases formobile communications that enable the tracking of inventory and packageswherever they are by using location-based information systems. Thelogistics and freight tracking use cases typically require lower datarates but need wide coverage and reliable location information.

In a wireless communication system, a user equipment (UE) receivesinformation through downlink (DL) from a base station (BS) and transmitinformation to the BS through uplink (UL). The information transmittedand received by the BS and the UE includes data and various controlinformation and includes various physical channels according totype/usage of the information transmitted and received by the UE and theBS.

FIG. 2 illustrates physical channels used in a 3GPP NR system and ageneral signal transmission method using the same.

When powered on or when a UE initially enters a cell, the UE performsinitial cell search involving synchronization with a BS in step S101.For initial cell search, the UE synchronizes with the BS and acquiresinformation such as a cell Identifier (ID) by receiving a primarysynchronization channel (P-SCH) and a secondary synchronization channel(S-SCH) from the BS. Then the UE may receive broadcast information fromthe cell on a physical broadcast channel (PBCH). In the meantime, the UEmay check a downlink channel status by receiving a downlink referencesignal (DL RS) during initial cell search.

After initial cell search, the UE may acquire more specific systeminformation by receiving a physical downlink control channel (PDCCH) andreceiving a physical downlink shared channel (PDSCH) based oninformation of the PDCCH in step S102.

The UE may perform a random access procedure to access the BS in stepsS103 to S106. For random access, the UE may transmit a preamble to theBS on a physical random access channel (PRACH) (S103) and receive aresponse message for preamble on a PDCCH and a PDSCH corresponding tothe PDCCH (S104). In the case of contention-based random access, the UEmay perform a contention resolution procedure by further transmittingthe PRACH (S105) and receiving a PDCCH and a PDSCH corresponding to thePDCCH (S106).

After the foregoing procedure, the UE may receive a PDCCH/PDSCH (S107)and transmit a physical uplink shared channel (PUSCH)/physical uplinkcontrol channel (PUCCH) (S108), as a general downlink/uplink signaltransmission procedure. Control information transmitted from the UE tothe BS is referred to as uplink control information (UCI). The UCIincludes hybrid automatic repeat and requestacknowledgement/negative-acknowledgement (HARQ-ACK/NACK), schedulingrequest (SR), channel state information (CSI), etc. The CSI includes achannel quality indicator (CQI), a precoding matrix indicator (PMI), arank indicator (RI), etc. While the UCI is transmitted on a PUCCH ingeneral, the UCI may be transmitted on a PUSCH when control informationand traffic data need to be simultaneously transmitted. In addition, theUCI may be aperiodically transmitted through a PUSCH according torequest/command of a network.

FIG. 3 illustrates a radio frame structure. In NR, uplink and downlinktransmissions are configured with frames. Each radio frame has a lengthof 10 ms and is divided into two 5-ms half-frames (HF). Each half-frameis divided into five 1-ms subframes (SFs). A subframe is divided intoone or more slots, and the number of slots in a subframe depends onsubcarrier spacing (SCS). Each slot includes 12 or 14 OrthogonalFrequency Division Multiplexing (OFDM) symbols according to a cyclicprefix (CP). When a normal CP is used, each slot includes 14 OFDMsymbols. When an extended CP is used, each slot includes 12 OFDMsymbols.

Table 1 exemplarily shows that the number of symbols per slot, thenumber of slots per frame, and the number of slots per subframe varyaccording to the SCS when the normal CP is used.

TABLE 1 SCS (15*2{circumflex over ( )}u) N_(symb) ^(slot) N_(slot)^(frame,u) N_(slot) ^(subframe,u)  15 KHz (u = 0) 14 10 1  30 KHz (u= 1) 14 20 2  60 KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u= 4) 14 160 16 *N_(symb) ^(slot): Number of symbols in a slot *N_(slot)^(frame,u): Number of slots in a frame *N_(slot) ^(subframe,u): Numberof slots in a subframe

Table 2 illustrates that the number of symbols per slot, the number ofslots per frame, and the number of slots per subframe vary according tothe SCS when the extended CP is used.

TABLE 2 SCS (15*2{circumflex over ( )}u) N_(symb) ^(slot) N_(slot)^(frame,u) N_(slot) ^(subframe,u) 60 KHz (u = 2) 12 40 4

The structure of the frame is merely an example. The number ofsubframes, the number of slots, and the number of symbols in a frame mayvary.

In the NR system, OFDM numerology (e.g., SCS) may be configureddifferently for a plurality of cells aggregated for one UE. Accordingly,the (absolute time) duration of a time resource (e.g., an SF, a slot ora TTI) (for simplicity, referred to as a time unit (TU)) consisting ofthe same number of symbols may be configured differently among theaggregated cells. Here, the symbols may include an OFDM symbol (or aCP-OFDM symbol) and an SC-FDMA symbol (or a Discrete FourierTransform-spread-OFDM (DFT-s-OFDM) symbol).

FIG. 4 illustrates a resource grid of a slot. A slot includes aplurality of symbols in the time domain. For example, when the normal CPis used, the slot includes 14 symbols. However, when the extended CP isused, the slot includes 12 symbols. A carrier includes a plurality ofsubcarriers in the frequency domain. A resource block (RB) is defined asa plurality of consecutive subcarriers (e.g., 12 consecutivesubcarriers) in the frequency domain. A bandwidth part (BWP) may bedefined to be a plurality of consecutive physical RBs (PRBs) in thefrequency domain and correspond to a single numerology (e.g., SCS, CPlength, etc.). The carrier may include up to N (e.g., 5) BWPs. Datacommunication may be performed through an activated BWP, and only oneBWP may be activated for one UE. In the resource grid, each element isreferred to as a resource element (RE), and one complex symbol may bemapped to each RE.

FIG. 5 illustrates a structure of a self-contained slot. In the NRsystem, a frame has a self-contained structure in which a DL controlchannel, DL or UL data, a UL control channel, and the like may all beincluded in one slot. For example, the first N symbols (hereinafterreferred to as a DL control region) in a slot may be used to transmit aDL control channel, and the last M symbols (hereinafter referred to as aUL control region) in the slot may be used to transmit a UL controlchannel. N and M are integers greater than 0. A resource region betweenthe DL control region and the UL control region (hereinafter referred toas a data region) may be used for DL data transmission or UL datatransmission. There may be a time gap for DL-to-UL or UL-to-DL switchingbetween the control region and the data region. For example, thefollowing configurations may be considered. Corresponding intervals arelisted in temporal order.

1. DL only configuration

2. UL only configuration

3. Mixed UL-DL configuration

-   -   DL region+Guard Period (GP)+UL control region;    -   DL control region+GP+UL region,    -   DL region: (i) DL data region or (ii) DL control region+DL data        region;    -   UL region: (i) UL data region or (ii) UL data region+UL control        region.

FIG. 6 illustrates an example in which a physical channel is mapped intoa self-contained slot. A PDCCH may be transmitted in the DL controlregion, and a PDSCH may be transmitted in the DL data region. A PUCCHmay be transmitted in the UL control region, and a PUSCH may betransmitted in the UL data region. The GP provides a time gap in theprocess of switching from the transmission mode to the reception mode orfrom the reception mode to the transmission mode. Some symbols at thetime of switching from DL to UL within a subframe may be configured asthe GP.

Hereinafter, each of the physical channels will be described in moredetail.

The PDCCH carries Downlink Control Information (DCI). For example, thePCCCH (i.e., DCI) carries a transmission format and resource allocationof a downlink shared channel (DL-SCH), resource allocation informationabout an uplink shared channel (UL-SCH), paging information about apaging channel (PCH), system information present on the DL-SCH, resourceallocation information about a higher layer control message such as arandom access response transmitted on a PDSCH, a transmit power controlcommand, and activation/release of configured scheduling (CS). The DCIincludes a cyclic redundancy check (CRC). The CRC is masked/scrambledwith different identifiers (e.g., Radio Network Temporary Identifier(RNTI)) according to the owner or usage of the PDCCH. For example, ifthe PDCCH is for a specific UE, the CRC will be masked with a UEidentifier (e.g., Cell-RNTI (C-RNTI)). If the PDCCH is for paging, theCRC will be masked with a Paging-RNTI (P-RNTI). If the PDCCH is forsystem information (e.g., a system information block (SIB)), the CRCwill be masked with a system information RNTI (SI-RNTI). If the PDCCH isfor a random access response, the CRC will be masked with a randomaccess-RNTI (RA-RNTI).

The PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs)depending on an aggregation level (AL). The CCE is a logical allocationunit used to provide a PDCCH having a predetermined code rate accordingto a radio channel state. A CCE consists of 6 Resource Element Groups(REGs). A REG is defined by one OFDM symbol and one (P)RB. The PDCCH istransmitted through a Control Resource Set (CORESET). The CORESET isdefined as a REG set having a given numerology (e.g., SCS, CP length). Aplurality of CORESETs for one UE may overlap with each other in thetime/frequency domain. A CORESET may be configured through systeminformation (e.g., a Master Information Block (MIB)) or UE-specifichigher layer (e.g. Radio Resource Control (RRC) layer) signaling.Specifically, the number of RBs and the number of OFDM symbols (amaximum of 3 OFDM symbols) that constitute the CORESET may be configuredby higher layer signaling.

To receive/detect a PDCCH, the UE monitors PDCCH candidates. The PDCCHcandidates represent the CCE(s) that the UE should monitor for PDCCHdetection. Each PDCCH candidate is defined as 1, 2, 4, 8, or 16 CCEsdepending on the AL. The monitoring includes (blind) decoding of thePDCCH candidates. A set of PDCCH candidates monitored by the UE isdefined as a PDCCH Search Space (SS). The SS includes a common searchspace (CSS) or a UE-specific search space (USS). The UE may acquire DCIby monitoring the PDCCH candidates in one or more SSs configured by theMIB or higher layer signaling. Each CORESET is associated with one ormore SSs, and each of the SSs is associated with one COREST. The SSs maybe defined based on the following parameters.

-   -   controlResourceSetId: Indicates a CORESET associated with an SS;    -   monitoringSlotPeriodicityAndOffset: Indicates a PDCCH monitoring        periodicity (in units of slots) and a PDCCH monitoring interval        offset (in units of slots);    -   monitoringSymbolsWithinSlot: Indicates PDCCH monitoring symbols        in a slot (e.g. the first symbol(s) of the CORESET);    -   nrofCandidates: Indicates the number of PDCCH candidates (one of        0, 1, 2, 3, 4, 5, 6, and 8) for each AL={1, 2, 4, 8, 16}.    -   An occasion (e.g., time/frequency resources) in which PDCCH        candidates should be monitored is defined as a PDCCH        (monitoring) occasion. One or more PDCCH (monitoring) occasions        may be configured in a slot.

Table 3 exemplarily shows the features of the respective search spacetypes.

TABLE 3 Search Type Space RNTI Use Case Type0- Common SI-RNTI on a SIBPDCCH primary cell Decoding Type0A- Common SI-RNTI on a SIB PDCCHprimary cell Decoding Type1- Common RA-RNTI or Msg2, Msg4 PDCCH TC-RNTIon a decoding in primary cell RACH Type2- Common P-RNTI on a PagingPDCCH primary cell Decoding Type3- Common INT-RNTI, PDCCH SFI-RNTI,TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI, orCS-RNTI(s) UE C-RNTI, or User specific Specific MCS-C-RNTI, or PDSCHCS-RNTI(s) decoding

Table 4 exemplarily shows DCI formats transmitted on the PDCCH.

TABLE 4 DCI format Usage 0_0 Scheduling of PUSCH in one cell 0_1Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1Scheduling of PDSCH in one cell 2_0 Notifying a group of UEs of the slotformat 2_1 Notifying a group of UEs of the PRB(s) and OFDM symbol(s)where UE may assume no transmission is intended for the UE 2_2Transmission of TPC commands for PUCCH and PUSCH 2_3 Transmission of agroup of TPC commands for SRS transmissions by one or more UEs

DCI format 0_0 may be used for scheduling of a TB-based (or TB-level)PUSCH, and DCI format 0_1 may be used for scheduling of a TB-based (orTB-level) PUSCH or a Code Block Group (CBG)-based (or CBG-level) PUSCH.DCI format 1_0 may be used for scheduling of a TB-based (or TB-level)PDSCH, and DCI format 1_1 may be used for scheduling of a TB-based (orTB-level) PDSCH or a CBG-based (or CBG-level) PDSCH (DL grant DCI). DCIformat 0_0/0_1 may be referred to as UL grant DCI or UL schedulinginformation, and DCI format 1_0/1_1 may be referred to as DL grant DCIor UL scheduling information. DCI format 2_0 is used to deliver dynamicslot format information (e.g., dynamic SFI) to the UE, and DCI format2_1 is used to deliver downlink pre-emption information to the UE. DCIformat 2_0 and/or DCI format 2_1 may be delivered to UEs in a group on agroup common PDCCH, which is a PDCCH delivered to UEs defined as onegroup.

DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCIformats, and DCI format 0_1 and DCI format 1_1 may be referred to asnon-fallback DCI formats. For the fallback DCI formats, the same DCIsize/field configuration is maintained regardless of the UEconfiguration. On the other hand, for the non-fallback DCI formats, theDCI size/field configuration varies according to the UE configuration.

The PDSCH carries downlink data (e.g., DL-SCH transport block (DL-SCHTB)), and a modulation technique such as Quadrature Phase Shift Keying(QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, or 256 QAM isapplied thereto. The TB is encoded to generate a codeword. The PDSCH maycarry a maximum of two codewords. Scrambling and modulation mapping maybe performed on each codeword, and the modulation symbols generated fromeach codeword may be mapped to one or more layers. Each of the layers ismapped to a resource together with a Demodulation Reference Signal(DMRS) to generate an OFDM symbol signal and transmit the signal througha corresponding antenna port.

The PUCCH carries Uplink Control Information (UCI). The UCI includes thefollowing information.

-   -   Scheduling Request (SR): Information that is used to request a        UL-SCH resource.    -   Hybrid Automatic Repeat Request (HARQ)-Acknowledgment (ACK): A        response to a downlink data packet (e.g., codeword) on the        PDSCH. HARQ-ACK indicates whether the downlink data packet has        been successfully received. In response to a single codeword,        one bit of HARQ-ACK may be transmitted. In response to two        codewords, two bits of HARQ-ACK may be transmitted. The HARQ-ACK        response includes positive ACK (simply, ACK), negative ACK        (NACK), DTX or NACK/DTX. Here, the HARQ-ACK is used        interchangeably used with HARQ ACK/NACK and ACK/NACK.    -   Channel State Information (CSI): Feedback information about a        downlink channel. Multiple Input Multiple Output (MIMO)-related        feedback information includes a Rank Indicator (RI) and a        Precoding Matrix Indicator (PMI).

Table 5 exemplarily shows PUCCH formats. PUCCH formats may be dividedinto Short PUCCHs (Formats 0 and 2) and Long PUCCHs (Formats 1, 3, and4) based on the PUCCH transmission duration.

TABLE 5 Length in OFDM PUCCH symbols Number format N_(symb) ^(PUCCH) ofbits Usage Etc 0 1-2  ≤2 HARQ, SR Sequence selection 1 4-14 ≤2 HARQ,[SR] Sequence modulation 2 1-2  >2 HARQ, CSI, [SR] CP-OFDM 3 4-14 >2HARQ, CSI, [SR] DFT-s-OFDM (no UE multiplexing) 4 4-14 >2 HARQ, CSI,[SR] DFT-s-OFDM (Pre DFT OCC)

PUCCH format 0 carries UCI having a size of up to 2 bits, and is mappedbased on a sequence and transmitted. Specifically, a UE transmits one ofa plurality of sequences on a PUCCH corresponding to PUCCH format 0 totransmit specific UCI to the eNB. Only when transmitting a positive SR,the UE transmits a PUCCH corresponding to PUCCH format 0 within a PUCCHresource for the corresponding SR configuration.

PUCCH format 1 carries UCI having a size of up to 2 bits, and themodulation symbols therefor are spread by an orthogonal cover code (OCC)(configured differently depending on whether frequency hopping isperformed) in the time domain. The DMRS is transmitted on a symbol onwhich a modulation symbol is not transmitted (namely, the DMRS istransmitted through time division multiplexing (TDM)).

PUCCH format 2 carries UCI having a bit size larger than 2 bits, and themodulation symbols are transmitted through frequency divisionmultiplexing (FDM) with the DMRS. The DM-RS is positioned on symbolindexes #1, #4, #7 and #10 in a resource block given with a density of1/3. A Pseudo Noise (PNA) sequence is used for the DM_RS sequence. Fortwo-symbol PUCCH format 2, frequency hopping may be enabled.

PUCCH format 3 is not subjected to UE multiplexing in the same physicalresource block, but carries UCI having a bit size larger than 2 bits. Inother words, the PUCCH resource of PUCCH format 3 does not include anOCC. The modulation symbols are transmitted through time divisionmultiplexing (TDM) with the DMRS.

PUCCH format 4 supports multiplexing with up to 4 UEs in the samephysical resource blocks and carries UCI having a bit size larger than 2bits. In other words, the PUCCH resource of PUCCH format 3 includes anOCC. The modulation symbols are transmitted through time divisionmultiplexing (TDM) with the DMRS.

The PUSCH carries uplink data (e.g., UL-SCH transport block (UL-SCH TB))and/or uplink control information (UCI), and is transmitted based on aCyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM)waveform or a Discrete Fourier Transform-spread-Orthogonal FrequencyDivision Multiplexing (DFT-s-OFDM) waveform. When the PUSCH istransmitted based on the DFT-s-OFDM waveform, the UE applies transformprecoding to transmit the PUSCH. For example, when the transformprecoding is not allowed (e.g., the transform precoding is disabled),the UE may transmit the PUSCH based on the CP-OFDM waveform. When thetransform precoding is allowed (e.g., the transform precoding isenabled), the UE may transmit the PUSCH based on the CD-OFDM waveform orthe DFT-s-OFDM waveform. PUSCH transmission may be dynamically scheduledby the UL grant in the DCI or semi-statically scheduled based on higherlayer (e.g., RRC) signaling (and/or Layer 1 (L1) signaling (e.g.,PDCCH)) (configured grant). The PUSCH transmission may be performed on acodebook basis or on a non-codebook basis.

FIG. 7 illustrates an ACK/NACK transmission procedure. Referring to FIG.7, the UE may detect a PDCCH in slot #n. Here, the PDCCH includesdownlink scheduling information (e.g., DCI format 1_0 or 1_1). The PDCCHindicates a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACKreporting offset (K1). For example, DCI format 1_0 or 1_1 may includethe following information.

-   -   Frequency domain resource assignment: Indicates an RB set        assigned to the PDSCH.    -   Time domain resource assignment: Indicates K0 and the starting        position (e.g. OFDM symbol index) and duration (e.g. the number        of OFDM symbols) of the PDSCH in a slot.    -   PDSCH-to-HARQ_feedback timing indicator: Indicates K1.

After receiving the PDSCH in slot #(n+K0) according to the schedulinginformation of slot #n, the UE may transmit UCI on the PUCCH in slot#(n+K1). Here, the UCI includes a HARQ-ACK response to the PDSCH. In thecase where the PDSCH is configured to transmit a maximum of one TB, theHARQ-ACK response may be configured in one bit. In the case where thePDSCH is configured to transmit a maximum of two TBs, the HARQ-ACKresponse may be configured in two bits if spatial bundling is notconfigured and may be configured in one bit if spatial bundling isconfigured. When slot #(n+K1) is designated as a HARQ-ACK transmissiontime for a plurality of PDSCHs, the UCI transmitted in slot #(n+K1)includes a HARQ-ACK response to the plurality of PDSCHs.

FIG. 8 illustrates an exemplary PUSCH transmission procedure. Referringto FIG. 8, a UE may detect a PDCCH in slot #n. The PDCCH may include ULscheduling information (e.g., DCI format 0_0, DCI format 0_1). DCIformat 0_0 and DCI format 0_1 may include the following information.

-   -   Frequency domain resource assignment: this indicates an RB set        allocated to a PUSCH.    -   Time domain resource assignment: this specifies a slot offset K2        indicating the starting position (e.g., symbol index) and length        (e.g., the number of OFDM symbols) of the PUSCH in a slot. The        starting symbol and length of the PUSCH may be indicated by a        start and length indicator value (SLIV), or separately.

The UE may then transmit the PUSCH in slot #(n+K2) according to thescheduling information in slot #n. The PUSCH includes a UL-SCH TB.

FIG. 9 illustrates exemplary multiplexing of UCI in a PUSCH. If aplurality of PUCCH resources overlap with a PUSCH resource in a slot anda PUCCH-PUSCH simultaneous transmission is not configured in the slot,UCI may be transmitted on a PUSCH (UCI piggyback or PUSCH piggyback), asillustrated. In the illustrated case of FIG. 9, an HARQ-ACK and CSI arecarried in a PUSCH resource.

Embodiment: UL Transmission

Deployment of a plurality of logical networks on a single physicalnetwork is under consideration in the NR system. The logical networksshould be able to support services having various requirements (e.g.,eMBB, mMTC, URLLC, etc.). Accordingly, the NR physical layer is designedso as to support a flexible transmission structure in consideration ofrequirements for various services. For example, the NR physical layermay change an OFDM symbol length (OFDM symbol duration) and a subcarrierspacing (SCS) (hereinafter, referred to as an OFDM numerology), whenneeded. Further, transmission resources of physical channels may bechanged within a predetermined range (in symbols). In NR, for example,the transmission lengths/starting transmission times of a PUCCH (PUCCHresource) and a PUSCH (PUSCH resource) may be configured flexibly withina predetermined range.

In a wireless communication system including eNBs and UEs, when a UEtransmits UCI on a PUCCH, a PUCCH resource may overlap with anotherPUSCH resource or a PUSCH resource. From the perspective of the same UE,for example, (1) a PUCCH (PUCCH resource) and another PUCCH (PUCCHresource) (for transmission of different UCIs) or (2) a PUCCH (PUCCHresource) and a PUSCH (PUSCH resource) may overlap with each other onthe time axis (in the same slot). The UE may not support PUCCH-PUCCHsimultaneous transmission or PUCCH-PUSCH simultaneous transmission(according to limited capabilities of the UE or configurationinformation received from an eNB). In this case, the UE may preferablymultiplex and transmit (1) different UCIs or (2) UCI(s) and UL data, asmuch as possible. However, (1) a PUCCH (PUCCH resource) and anotherPUCCH (PUCCH resource) or (2) a PUCCH (PUCCH resource) and a PUSCH(PUSCH resource), which overlap with each other on the time axis (in aslot) may differ in transmission lengths (e.g., the numbers of symbols)and/or starting transmission times (e.g., starting symbols) in the NRsystem. Therefore, from the perspective of a processing time at the UE,the UE may have difficulty in multiplexing (1) different UCIs or (2)UCI(s) and UL data, for transmission. For example, a PUCCH carrying anacknowledgement/negative acknowledgement (A/N) (hereinafter, referred toas an A/N PUCCH) may (fully or partially) overlap with a PUCCH carryingan SR (hereinafter, referred to as an SR PUCCH) on the time axis. Inthis case, upon recognition of the existence of the A/N PUCCH overlappedwith the SR PUCCH after the UE starts to transmit the SR PUCCH orcompletes preparation for transmission of the SR PUCCH, it may bedifficult for the UE to multiplex and transmit the A/N and the SR in theA/N PUCCH.

In the existing NR system, if an A/N PUCCH resource fully overlaps withan SR PUCCH resource on the time axis (i.e., the transmission periods ofan A/N PUCCH and an SR PUCCH coincide with each other), the followingUCI multiplexing rule is applied according to the PUCCH format of theA/N PUCCH. Herein, a positive SR indicates the presence of UL data to betransmitted by a UE, and a negative SR indicates the absence of UL datato be transmitted by the UE.

(1) Case in which the A/N PUCCH is in PUCCH format 0.

A. If the UCI state of an SR is positive SR,

-   -   an A/N is transmitted in a resource resulting from applying a        CS/OCC/PRB offset to an A/N PUCCH.

B. If the UCI state of the SR is negative SR,

-   -   the A/N is transmitted in an A/N PUCCH resource.

(2) Case in which the A/N PUCCH is in PUCCH format 1.

A. If the UCI state of the SR is positive SR,

-   -   the A/N is transmitted in an SR PUCCH resource.

B. If the UCI state of the SR is negative SR,

-   -   the A/N is transmitted in the A/N PUCCH resource.

(3) Case in which the A/N PUCCH is in one of PUCCH formats 2, 3 and 4.

A. If the UCI state of the SR is positive SR or negative SR,

-   -   UCI payload is generated by representing an SR by explicit        bit(s) and appending the SR to the A/N, and the generated UCI is        transmitted in the A/N PUCCH resource.

However, the conventional approach defines a UCI multiplexing schemeonly for the case where an A/N PUCCH resource and an SR PUCCH resourcefully overlap with each other on the time axis. Accordingly, there is aneed for discussing a UCI multiplexing scheme in consideration ofvarious scenarios, for efficient UCI transmission.

To address the above-described problem, an operation of multiplexing UCIand/or data in UL channel(s) overlapped with each other on the time axisis proposed in the present disclosure. Specifically, an operation ofmultiplexing UCI and/or data of UL channel(s) overlapped with each otheron the time axis, taking into account the starting transmission time(s)and/or UE processing time(s) of the UL channel(s) is proposed in thepresent disclosure.

Terms as used herein are first defined as follows.

-   -   UCI: UL control information transmitted by a UE. The UCI        includes multiple types of control information (i.e., UCI        types). For example, the UCI may include HARQ-ACK (shortly, A/N        or AN), SR, and CSI.    -   PUCCH: A physical UL channel carrying UCI. For the convenience,        PUCCH resources configured and/or indicated for transmitting an        A/N, an SR, and CSI by an eNB are referred to as an A/N PUCCH        resource, an SR PUCCH resource, and a CSI PUCCH resource,        respectively.    -   PUSCH: A physical UL channel carrying UL data.    -   UCI multiplexing: It may mean an operation of transmitting        different UCIs (UCI types) on a common physical UL channel        (e.g., a PUCCH or a PUSCH). UCI multiplexing may include        multiplexing of different UCIs (UCI types). For the convenience,        the multiplexed UCI is referred to as MUX UCI. Further, the UCI        multiplexing may include an operation performed in relation to        MUX UCI. For example, the UCI multiplexing may include a process        of determining a UL channel resource to transmit MUX UCI.    -   UCI/data multiplexing: It may mean an operation of transmitting        UCI and data on a common physical UL channel (e.g., PUSCH).        UCI/data multiplexing may include an operation of multiplexing        UCI with data. For the convenience, the multiplexed UCI is        referred to as MUX UCI/Data. Further, UCI/data multiplexing may        include an operation performed in relation to MUC UCI/Data. For        example, the UCI/data multiplexing may include a process of        determining UL channel resources to transmit MUX UCI/Data.    -   Slot: It is a basic time unit (TU) (or time interval) for data        scheduling. A slot includes a plurality of symbols. Herein, a        symbol may be an OFDM-based symbol (e.g., a CP-OFDM symbol or a        DFT-s-OFDM symbol). In the present disclosure, the terms,        symbol, OFDM-based symbol, OFDM symbol, CP-OFDM symbol, and        DFT-s-OFDM symbol may be interchangeably used.    -   Overlapped UL channel resource(s): It means UL channel (e.g.,        PUCCH and PUSCH) resource(s) overlapped (at least partially)        with each other on the time axis within a predetermined time        period (e.g., slot). The overlapped UL channel resource(s) may        mean UL channel resource(s) prior to UCI multiplexing.

The following PUCCH formats may be defined according to UCI payloadsizes and/or transmission lengths (e.g., the numbers of symbols includedin PUCCH resources). In regard to the PUCCH formats, Table 5 may also bereferred to.

(0) PUCCH format 0 (PF0 or F0)

-   -   Supported UCI payload size: up to K bits (e.g., K=2)    -   Number of OFDM symbols in single PUCCH: 1 to X symbols (e.g.,        X=2)    -   Transmission structure: Only a UCI signal without DM-RS is        included, and a UCI state is transmitted by selecting and        transmitting one of a plurality of sequences.

(1) PUCCH format 1 (PF1 or F1)

-   -   Supported UCI payload size: up to K bits (e.g., K=2)    -   Number of OFDM symbols in single PUCCH: Y to Z symbols (e.g.,        Y=4 and Z=14)    -   Transmission structure: DM-RS and UCI are configured in TDM in        different OFDM symbols, and the UCI is the product between a        specific sequence and modulation symbols (e.g., QPSK symbols).        CDM between a plurality of PUCCH resources (conforming to PUCCH        format 1) (within the same RB) is supported by applying cyclic        shifts(CSs)/orthogonal cover codes (OCCs) to both of the UCI and        the DM-RS.

(2) PUCCH format 2 (PF2 or F2)

-   -   Supported UCI payload size: more than K bits (e.g., K=2)    -   Number of OFDM symbols in single PUCCH: 1 to X symbols (e.g.,        X=2)    -   Transmission structure: DM-RS and UCI are configured/mapped in        FDM within the same symbol, and encoded UCI bits are subjected        only to IFFT without DFT, for transmission.

(3) PUCCH format 3 (PF3 or F3)

-   -   Supported UCI payload size: more than K bits (e.g., K=2)    -   Number of OFDM symbols in single PUCCH: Y to Z symbols (e.g.,        Y=4 and Z=14)    -   Transmission structure: DM-RS and UCI are configured/mapped in        TDM in different OFDM symbols, and encoded UCI bits are        subjected to DFT, for transmission. Multiplexing between a        plurality of UEs is supported by applying an OCC to the UCI and        a CS (or IFDM mapping) to the DM-RS at the front end of DFT.

(4) PUCCH format 4 (PF4 or F4)

-   -   Supported UCI payload size: more than K bits (e.g., K=2)    -   Number of OFDM symbols in single PUCCH: Y to Z symbols (e.g.,        Y=4 and Z=14)    -   Transmission structure: DM-RS and UCI are configured/mapped in        TDM in different OFDM symbols, and encoded UCI bits are        subjected to DFT, without multiplexing between UEs.

A PUCCH resource may be determined on a UCI type basis (e.g., for eachof A/N, SR, and CSI). A PUCCH resource used for UCI transmission may bedetermined based on the size of the UCI (UCI payload). For example, theeNB may configure a plurality of PUCCH resource sets for the UE, and theUE may select a specific PUCCH resource set corresponding to a specificrange according to a range of UCI (UCI payload) sizes (e.g., numbers ofUCI bits). For example, the UE may select one of the following PUCCHresource sets according to the number of UCI bits, N_(UCI).

-   -   PUCCH resource set #0, if the number of UCI bits≤2    -   PUCCH resource set #1, if 2<the number of UCI bits≤N₁    -   PUCCH resource set #(K−1), if N_(K−2)<the number of UCI        bits≤N_(K−1)

Herein, K represents the number of PUCCH resource sets (K>1), and N_(i)represents a maximum number of UCI bits supported by PUCCH resource set#i. For example, PUCCH resource set #1 may include resources of PUCCHformats 0 to 1, and the other PUCCH resource sets may include resourcesof PUCCH formats 2 to 4 (see Table 5),

If SR and CSI are given as UCI types, PUCCH resources to be used for UCItransmission in a PUCCH resource set may be configured by higher-layersignaling (e.g., RRC signaling). If HARQ-ACK for a semi-persistentscheduling (SPS) PDSCH is given as a UCI type, a PUCCH resource to beused for UCI transmission in a PUCCH resource set may be configured byhigher-layer signaling (e.g., RRC signaling). On the other hand, ifHARQ-ACK for a normal PDSCH (i.e., a PDSCH scheduled by DCI) is given asa UCI type, a PUCCH resource to be used for UCI transmission in a PUCCHresource set may be scheduled by DCI.

In the case of DCI-based PUCCH resource scheduling, the eNB may transmitDCI to the UE on a PDCCH, and indicate a PUCCH resource to be used forUCI transmission in a specific PUCCH resource set by an ACK/NACKresource indicator (ARI) in the DCI. The ARI is used to indicate a PUCCHresource for ACK/NACK transmission, also referred to as a PUCCH resourceindicator (PRI). Herein, the DCI may be used for PDSCH scheduling, andthe UCI may include an HARQ-ACK for a PDSCH. For the UE, the eNB mayconfigure a PUCCH resource set including more PUCCH resources thanstates representable by the ARI by (UE-specific) higher-layer signaling(e.g., RRC signaling). The ARI may indicate a PUCCH resource subset ofthe PUCCH resource set, and which PUCCH resource in the indicated PUCCHresource subset to be used may be determined according to an implicitrule based on transmission resource information about a PDCCH (e.g., thestarting CCE index of the PDCCH or the like).

Unless conflicting with each other, each of the following proposedmethods may be applied in conjunction with other proposed methods.

PUCCH/PUCCH Multiplexing

[Proposed method #1] an A/N PUCCH resource and an SR PUCCH resource mayoverlap with each other on the time axis (over all or part of the OFDMsymbols of a PUCCH). In this case, the UE may determine whether tomultiplex an A/N with a (positive) SR depending on whether an A/N PUCCHresource corresponding to (or indicated by) PDSCH(s) (and/or PDCCH(s))which has been received (or of which the transmission has started) untila specific time (earlier than a reference time) overlaps with the SRPUCCH resource on the time axis.

However, if the UE does not multiplex the A/N with the (positive) SR,the UE may drop the transmission of one of the A/N and the (positive)SR.

For example, the UE may determine whether to multiplex the A/N with the(positive) SR depending on whether an A/N PUCCH resource correspondingto (or indicated by) PDSCH(s) (and/or PDCCH(s)) which has been received(or of which the transmission has started) until a time Tref,sr earlierthan the starting transmission time (e.g., starting symbol) Tsr of theSR PUCCH by T₀ overlaps with the SR PUCCH resource on the time axis.Tref,sr may be defined as Tref,sr=Tsr−T₀ and represented in OFDMsymbols.

(Case 1) If the A/N PUCCH resource corresponding to (or indicated by)the PDSCH(s) (and/or PDCCH(s)) which has been received (or of which thetransmission has started) until Tref,sr overlaps with the SR PUCCHresource on the time axis, the UE may multiplex the A/N with the(positive) SR and transmit the multiplexed A/N and (positive) SR (or theUE may follow the UCI multiplexing rule applied to the case where an A/NPUCCH and an SR PUCCH overlap with each other over all symbols of aPUCCH on the time axis).

(1) The A/N PUCCH is in PUCCH format 0.

A. If the UCI state of the SR is positive SR,

-   -   the A/N is transmitted in a resource resulting from applying a        CS/OCC/PRB offset to the A/N PUCCH.

B. If the UCI state of an SR is negative SR,

-   -   the A/N is transmitted in the A/N PUCCH resource.

(2) The A/N PUCCH is in PUCCH format 1.

A. If the UCI state of the SR is positive SR,

-   -   the A/N is transmitted in the SR PUCCH resource. However, if the        SR PUCCH is in PUCCH format 0, only the A/N may be transmitted,        while the SR transmission is dropped.

B. If the UCI state of the SR is negative SR,

-   -   the A/N is transmitted in the A/N PUCCH resource.

(3) The A/N PUCCH is in one of PUCCH formats 2, 3 and 4.

A. If the UCI state of the SR is positive SR or negative SR,

-   -   UCI payload is generated by representing the SR in explicit        bit(s) and appending the SR to the A/N, and the generated UCI is        transmitted in the A/N resource.

(Case 2) In any other case than (Case 1), the UE may select and transmitone of the A/N and the (positive) SR. For example, (i) if an A/N PUCCHresource corresponding to (or indicated by) PDSCH(s) (and/or PDCCH(s))which has been received (or of which the transmission has started/ended)after Tref,sr overlaps with the SR PUCCH resource on the time axis, (ii)if an A/N PUCCH resource corresponding to (or indicated by) the PDSCH(s)(and/or PDCCH(s)) which has been received (or of which the transmissionhas started) until Tref,sr does not overlap with the SR PUCCH resourceon the time axis, or (iii) if there is no A/N PUCCH resourcecorresponding to (or indicated by) the PDSCH(s) (and/or PDCCH(s)) whichhas been received (or of which the transmission has started) untilTref,sr, the UE may select and transmit one of the A/N and the(positive) SR.

(1) If the UCI state of the SR is positive SR,

-   -   the SR is transmitted in the SR PUCCH resource (the A/N        transmission is dropped).

(2) If the UCI state of the SR is negative SR,

-   -   the A/N is transmitted in the A/N PUCCH resource.

T₀ may be one of the following values. T₀ may be represented in (OFDM)symbols.

(1) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for demodulation according to a UEcapability or a value corresponding to the UE processing time.

(4) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(5) A value preset between an eNB and a UE (e.g., a fixed value).

[Proposed method #1] may also be extended to any other PUCCH than theA/N PUCCH.

In the NR system, if the starting (OFDM) symbols (or starting times) ofan A/N PUCCH and an SR PUCCH coincide with each other, a UE operation ofapplying the UCI multiplexing rule configured for the case in which anA/N PUCCH and an SR PUCCH fully overlap with each other has been agreedon. On the other hand, if the starting (OFDM) symbols (or startingtimes) of an A/N PUCCH and an SR PUCCH are different, a method ofdetermining whether to multiplex an A/N with an SR by comparing the A/NPUCCH with the SR PUCCH in terms of their starting (OFDM) symbols (orstarting times) has been discussed. For example, if the starting (OFDM)symbol of the SR PUCCH is earlier than the starting (OFDM) symbol of theA/N PUCCH, the UE may transmit the SR PUCCH, dropping the A/Ntransmission. On the contrary, if the starting (OFDM) symbol of the SRPUCCH is later than the starting (OFDM) symbol of the A/N PUCCH, the UEmay UCI-multiplex the SR and the A/N and transmit the multiplexed SR andA/N on a single PUCCH. It seems that this operation has been proposed inthat if the UE is aware of the presence of the A/N transmission afterpreparing for the SR transmission (or during the SR transmission), anoperation of UCI-multiplexing the A/N and the SR and transmitting themultiplexed A/N and SR, while canceling the SR transmission is difficultin terms of UE implementation. However, even though the starting (OFDM)symbol of the SR PUCCH is earlier than the starting (OFDM) symbol of theA/N PUCCH, if a PDSCH (and/or a PDCCH) corresponding to the A/N PUCCHhas been received much earlier, the UE may transmit the A/N and the SRthrough UCI multiplexing. Therefore, the conventional method is notpreferable in that even a UE capable of UCI-multiplexing an A/N and anSR in terms of a UE processing time drops the A/N transmission.

Therefore, to support multiplexing between an A/N and an SR, a timepoint based on which the UE may determine whether to transmit (i) SRonly or (ii) the SR and the A/N through multiplexing may be clearlyindicated to the UE. For example, if a A/N PUCCH resource for PDSCH(s)(and/or PDCCH(s)) received until a time Tref,sr earlier than thestarting transmission time Tsr of a specific SR PUCCH by T₀ does notoverlap with an SR PUCCH resource on the time axis, the UE may determineto transmit the SR PUCCH, if the SR is a positive SR. Herein, eventhough an A/N PUCCH resource for PDSCH(s) (and/or PDCCH(s)) receivedafter Tref,sr overlaps with the SR PUCCH resource on the time axis, theUE may transmit the SR PUCCH, dropping the A/N transmission. On theother hand, if the A/N PUCCH resource for the PDSCH(s) (and/or thePDCCH(s)) received until Tref,sr overlaps with the SR PUCCH resource onthe time axis, (i) when SR information is a positive SR, the UE mayUCI-multiplex the A/N and the SR and transmit the multiplexed A/N and SRin a single PUCCH resource, and (ii) when the SR information is anegative SR, the UE may transmit only the A/N on the A/N PUCCH or mayappend explicit bit(s) representing the negative SR to the A/N andtransmit the A/N appended with the explicit bit(s) on the A/N PUCCH.

Even though the A/N PUCCH resource is updated later not to overlap withthe SR PUCCH, since the UE has already determined to UCI-multiplex theA/N and the SR, the UE may still transmit UCI-multiplexed A/N and SR ina single PUCCH resource, without cancelling the determination.

FIG. 10 illustrates an exemplary operation for an A/N PUCCH of PUCCHformats 0/2/3/4. FIG. 11 illustrates an exemplary operation for an A/NPUCCH of PUCCH format 1.

[Proposed method #1] is based on the assumption that the UE is capableof identifying the presence or absence of an A/N PUCCH corresponding toPDSCH(s) (and/or PDCCH(s)) terminated/received before Tref,sr (i.e.,Tsr−T₀), before determining to transmit an SR PUCCH. That is, in[proposed method #1], it is considered that the UE has difficulty inidentifying the presence or absence of an A/N PUCCH corresponding toPDSCH(s) (and/or PDCCH(s)) terminated/received after Tref,sr, before theUE determines to transmit the SR PUCCH, and thus the presence or absenceof the A/N PUCCH is not taken into account in determining whether theA/N and the SR are to be multiplexed. According to [proposed method #1],if an A/N PUCCH resource for PDSCH(s) (and/or PDCCH(s))terminated/received before Tref,sr overlaps with an SR PUCCH resource onthe time axis, the UE may multiplex an A/N with an SR and transmit themultiplexed A/N and SR. If the A/N PUCCH does not exist or does notoverlap with the SR PUCCH on the time axis, the UE may transmit the SRonly, which facilitates UE implementation. Further, multiplexing betweenan A/N and an SR is allowed in most cases, and thus dropping of A/N orSR transmissions may be reduced in [proposed method #1]. Further,[proposed method #1] is advantageous in that even when an A/N and an SRare multiplexed and transmitted on an SR PUCCH (e.g., both of an A/NPUCCH and the SR PUCCH are in F1), a minimum PDSCH-to-HARQ-ACKtransmission processing time is guaranteed for A/N transmission, thusoffering a unified solution. If a plurality of SR PUCCHs distinguishablefrom each other are configured in one slot, the UE may determine for anearlier SR PUCCH whether the SR PUCCH can be multiplexed with an A/N,and if the A/N transmission is not to be dropped, determine for the nextSR PUCCH whether the SR PUCCH can be multiplexed with the A/N. In thismanner, the UE may sequentially perform the foregoing operation.

In a modification to [proposed method #1], if an A/N PUCCH correspondingto PDSCH(s) (and/or PDCCH(s)) of which the transmission has starteduntil Tref,sr (i.e., Tsr−To) overlaps with an SR PUCCH, an A/N may bemultiplexed with an SR. Otherwise, only the SR may be transmitted. Thisoperation is based on the assumption that if the starting transmissiontime of the PDSCH (and/or PDCCH(s)) (corresponding to the A/N PUCCH) isearlier than (or coincides with) Tref,sr, the UE has a sufficient timefor detecting and demodulating a PDCCH (e.g., a DL assignment)corresponding to the PDSCH and thus is capable of identifying thepresence of the A/N PUCCH colliding with the SR PUCCH before determiningto transmit the SR PUCCH. Therefore, If the starting transmission timeof the PDSCH (and/or PDCCH(s)) (corresponding to the A/N PUCCH) is laterthan Tref,sr, the UE does not have a sufficient time for detecting anddemodulating the PDCCH (e.g., the DL assignment) corresponding to thePDSCH and thus does not take the PDSCH(s) into account in determiningwhether to multiplex the A/N and the SR.

In a modification to [proposed method #1], if an A/N PUCCH resource andan SR PUCCH resource which are to be transmitted by the UE overlap witheach other (over part of the OFDM symbols of a PUCCH) on the time axis,it may be determined whether to multiplex an A/N and an SR according toa relative relationship between the ending (or starting) transmissiontime of PDSCH(s) (and/or PDCCH(s)) corresponding to the A/N PUCCHresource and the starting transmission time of an SR PUCCH.

However, if the UE does not multiplex the A/N and the (positive) SR, theUE may drop transmission of one of the A/N and the (positive) SR.

For example, the UE may determine whether to multiplex the A/N and the(positive) SR according to whether the ending (or starting) transmissiontime of the PDSCH(s) (and/or PDCCH(s)) (corresponding to the A/N PUCCHresource) is earlier/later than Tref,sr (i.e., Tsr−To), in the followingmanner.

(1) If the ending (or starting) transmission time of the PDSCH(s)(and/or PDCCH(s)) (corresponding to the A/N PUCCH resource) is laterthan Tref,sr,

A. one of the A/N and the (positive) SR is selected and transmitted.

i. If the UCI state of the SR is positive SR,

1. the SR is transmitted in the SR PUCCH resource (the A/N transmissionis dropped).

ii. If the UCI state of the SR is negative SR,

1. the A/N is transmitted in the A/N PUCCH resource.

(2) If the ending (or starting) transmission time of the PDSCH(s)(and/or PDCCH(s)) (corresponding to the A/N PUCCH resource) is earlierthan (or coincides with Tref,sr,

A. the A/N and the (positive) SR are multiplexed and transmitted (or theUCI multiplexing rule applied to the case where an A/N PUCCH and an SRPUCCH fully overlap with each other over all OFDM symbols of a PUCCH isfollowed).

i. Case in which the A/N PUCCH is in PUCCH format 0.

1. If the UCI state of the SR is positive SR,

-   -   the A/N is transmitted in a resource resulting from applying a        CS/OCC/PRB offset to the A/N PUCCH.

2. If the UCI state of the SR is negative SR,

-   -   the A/N is transmitted in the A/N PUCCH resource.

ii. Case in which the A/N PUCCH is in PUCCH format 1.

1. If the UCI state of the SR is positive SR,

-   -   the A/N is transmitted in the SR resource. However, if the SR        PUCCH is in PUCCH format 0, only the A/N may be transmitted,        while the SR transmission is dropped.

2. If the UCI state of the SR is negative SR,

-   -   the A/N is transmitted in the A/N PUCCH resource.

iii. Case in which the A/N PUCCH is in one of PUCCH formats 2, 3 and 4.

1. If the UCI state of the SR is positive SR or negative SR,

-   -   UCI payload is generated by representing the SR in explicit        bit(s) and appending the SR to the A/N, and then the generated        UCI is transmitted in the A/N PUCCH resource.

T₀ may be one of the following values, and represented in (OFDM)symbols.

(1) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for demodulation according to a UEcapability or a value corresponding to the UE processing time.

(4) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(5) A value preset between an eNB and a UE (e.g., a fixed value).

In a modification to [proposed method #1], the following operation maybe performed for UCI multiplexing between an A/N and CSI, similarly toUCI multiplexing between an A/N and an SR. For example, an A/N PUCCHresource and a CSI PUCCH resource may overlap with each other (over allor part of the OFDM symbols of a PUCCH) on the time axis. In this case,the UE may determine whether to multiplex between an A/N and CSIdepending on whether an A/N PUCCH resource corresponding to (orindicated by) PDSCH(s) and/or PDCCH(s)) which has been received (or ofwhich the transmission has started) until a specific time (earlier thana reference time)) overlaps with a CSI PUCCH resource on the time axis.

However, if the UE does not multiplex the A/N with the CSI, the UE maydrop transmission of one of the A/N and the CSI.

For example, the UE may determine whether to multiplex the A/N and theCSI depending on whether an A/N PUCCH resource corresponding to (orindicated by) PDSCH(s) and/or PDCCH(s)) which has been received (or ofwhich the transmission has started) until a time Tref,csi earlier thanthe starting transmission time (e.g., starting symbol) Tcsi of a CSIPUCCH by T₀ overlaps with the CSI PUCCH resource on the time axis.Tref,csi may be defined as Tref,csi=Tcsi−T₀ and represented in OFDMsymbols. Tref,csi may be defined as Tref,csi=Tcsi−T₀ and represented inOFDM symbols.

(Case 1) If the A/N PUCCH resource corresponding to (or indicated by)the PDSCH(s) (and/or PDCCH(s)) which has been received (or of which thetransmission has started) until Tref,csi overlaps with the CSI PUCCHresource on the time axis, the UE may multiplex the A/N and the CSI andtransmit the multiplexed A/N and CSI.

(1) If the A/N PUCCH is indicated by a DL assignment,

-   -   the A/N and the CSI are multiplexed and transmitted in the A/N        PUCCH resource.

(2) If the A/N PUCCH is not indicated by a DL assignment,

-   -   the A/N and the CSI are multiplexed and transmitted in the CSI        PUCCH resource.

(Case 2) In any other case than (Case 1), the UE may select and transmitone of the A/N and the CSI. For example, (i) if an A/N PUCCH resourcecorresponding to (or indicated by) PDSCH(s) (and/or PDCCH(s)) which hasbeen received (or of which the transmission has started/ended) afterTref,csi overlaps with the CSI PUCCH resource on the time axis, (ii) ifan A/N PUCCH resource corresponding to (indicated by) PDSCH(s) (and/orPDCCH(s)) which has been received (or of which the transmission hasstarted) until Tref,csi does not overlap with the CSI PUCCH resource onthe time axis, or (iii) if there is no A/N PUCCH resource correspondingto (or indicated) by the PDSCH(s) and/or PDCCH(s)) which has beenreceived (or of which the transmission has started) until Tref,csi, theUE may select and transmit one of the A/N and the CSI.

(1) Opt. 1: The CSI is transmitted in the CSI PUCCH resource (the A/Ntransmission is dropped).

(2) Opt. 2: The A/N is transmitted in the A/N PUCCH resource (the CSItransmission is dropped).

T₀ may be one of the following values. T₀ may be represented in (OFDM)symbols.

(1) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for demodulation according to a UEcapability or a value corresponding to the UE processing time.

(4) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(5) A value preset between an eNB and a UE (e.g., a fixed value).

[Proposed method #1A] If PUCCH resources for transmission configuredfor/indicated to the UE overlap with each other over all or part of OFDMsymbols on the time axis in a slot, the UE performs UCI multiplexingaccording to the following UCI multiplexing rule.

(1) If the overlapped PUCCH resources in the slot satisfy all or part ofthe following conditions, the UE multiplexes and transmits UCIs for theoverlapped PUCCH resources in a single PUCCH resource (hereinafter,referred to as MUX PUCCH).

A. Condition #1

i. Opt. 1: On the assumption that the UCIs for the overlapped PUCCHresources in the slot are multiplexed (if there is a PUCCH resource forHARQ-ACK transmission in the overlapped PUCCH resources in the slot),the first (OFDM) symbol of the (single) PUCCH resource to carry themultiplexed UCI starts after T₁ from the last (OFDM) symbol of (each of)PDSCH(s) corresponding to an HARQ-ACK and/or SPS PDSCH release(s).

ii. Opt. 2: (If there is a PUCCH resource for HARQ-ACK transmission inthe overlapped PUCCH resources in the slot), the first (OFDM) symbol ofthe slot (or the first (OFDM) symbol allowed for UL transmission in theslot) starts after T₁ from the last (OFDM) symbol of (each of) PDSCH(s)corresponding to an HARQ-ACK (or SPS PDSCH release(s)).

iii. Opt. 3: On the assumption that the UCIs for the overlapped PUCCHresources in the slot are multiplexed (if there is a PUCCH resource forHARQ-ACK transmission in the overlapped PUCCH resources in the slot),the first (OFDM) symbol of the (time-axis) earliest of the (single)PUCCH resource to carry the multiplexed UCI and the overlapped PUCCHresources in the slot starts after T₁ from the last (OFDM) symbol of(each of) PDSCH(s) corresponding to an HARQ-ACK (or the SPS PDSCHrelease(s)).

iv. Opt. 4: On the assumption that the UCIs for the overlapped PUCCHresources in the slot are multiplexed (if there is a PUCCH resource forHARQ-ACK transmission in the overlapped PUCCH resources in the slot),the first (OFDM) symbol of the (time-axis) earliest of the (single)PUCCH resource to carry the multiplexed UCI and overlapped CSIresource(s) in the slot starts after T₁ from the last (OFDM) symbol of(each of) PDSCH(s) corresponding to an HARQ-ACK (or the SPS PDSCHrelease(s)).

v. Opt. 5: (If there is a PUCCH resource for HARQ-ACK transmission inthe overlapped PUCCH resources in the slot), the first (OFDM) symbol ofthe (time-axis) earliest of (all) PUCCH resource(s) for any UCIcombination/UCI payload in the slot, configured for the UE starts afterT₁ from the last (OFDM) symbol of (each of) PDSCH(s) corresponding to anHARQ-ACK (or SPS PDSCH release(s)).

B. Condition #2

i. Opt. 1: On the assumption that the UCIs for the overlapped PUCCHresources in the slot are multiplexed (if there is a PUCCH resource fortransmission, indicated by DCI among the overlapped PUCCH resources inthe slot), the first (OFDM) symbol of the (time-axis) earliest of a(single) PUCCH resource selected according to a specific rule and theoverlapped PUCCH resources in the slot starts after T₂ from the last(OFDM) symbol of the (scheduling) DCI.

ii. Opt. 2: (If there is a PUCCH resource for transmission, indicated byDCI among the overlapped PUCCH resources in the slot,) the first (OFDM)symbol of the (time-axis) earliest of the overlapped PUCCH resources inthe slot starts after T₂ from the last (OFDM) symbol of the (scheduling)DCI.

iii. Opt. 3: (If there is a PUCCH resource for transmission, indicatedby DCI among the overlapped PUCCH resources in the slot,) the first(OFDM) symbol of the (time-axis) earliest of (all) PUCCH resource(s) forany UCI combination/UCI payload in the slot, configured for the UEstarts after T₂ from the last (OFDM) symbol of the (scheduling) DCI.

iv. Opt. 4: (If there is a PUCCH resource for transmission, indicated byDCI among the overlapped PUCCH resources in the slot,), the first (OFDM)symbol of the slot (or the first (OFDM) symbol allowed for ULtransmission in the slot) starts after T₂ from the last (OFDM) symbol ofthe (scheduling) DCI.

Herein, a (scheduling) DCI-based PUCCH resource may be a PUCCH resourcecarrying an HARQ-ACK, allocated by DCI. The last symbol of DCI may bethe last symbol in which a PDCCH carrying the DCI is transmitted.

(2) If (part of) the overlapped PUCCH resources in the slot do notsatisfy the above condition(s), the UE may perform the followingoperations.

A. Opt. 1: The UE does not expect the case of (2). If the case of (2)occurs, the UE operates according to UE implementation.

B. Opt. 2: The UE multiplexes UCI(s) for the remaining PUCCH resource(s)satisfying the condition(s) in (1) and transmits the multiplexed UCI ina single PUCCH resource, while dropping transmission of UCI(s) for(some) PUCCH resource(s) failing to satisfy the condition(s) in (1).

C. Opt. 3: The UE drops transmission of the PUCCH resource(s) in theslot.

D. Opt. 4: The UE transmits only a specific (one) PUCCH resource (amongthe overlapped PUCCH resources in the slot) (e.g., a PUCCH resourcecarrying UCI of a highest priority or an earliest PUCCH resource on thetime axis), while dropping transmission of the other PUCCH resources.

However, on the assumption that UCIs for overlapped PUCCH resources (ofwhich the transmission is indicated by higher-layer signaling (e.g., RRCsignaling) and/or DCI) in a slot are multiplexed, a new (single) PUCCHresource (MUX PUCCH) to carry the multiplexed UCI may be determinedaccording to a specific rule which is set based on a UCI combination (tobe multiplexed), a (total) UCI payload size, and so on.

T_(f) may be a value corresponding to a UE processing time required totransmit an HARQ-ACK after the UE receives a PDSCH. Further, T₂ is avalue corresponding to a UE processing time required to perform ULtransmission after the UE receives (scheduling) DCI. T₁ and T₂ may berepresented in (OFDM) symbols.

When the UE determines whether to multiplex UCIs between PUCCH resourcesoverlapped on the time axis, the UE may consider at least two timelineconditions. Timeline condition #1 is intended to ensure a UE processingtime from PDSCH reception until HARQ-ACK transmission. Timelinecondition #1 aims to allow transmission of an HARQ-ACK after apredetermined time T₁ from the last (OFDM) symbol of PDSCH(s)corresponding to the HARQ-ACK. Therefore, the condition based on T₁should be applied based on a UL resource carrying the HARQ-ACK. Ifoverlapped UCIs are multiplexed, the condition based on T₁ may beapplied between the starting time of a PUCCH resource determined(according to a specific rule) and the last (OFDM) symbol of PDSCH(s)corresponding to an HARQ-ACK. Timeline condition #2 is intended toensure a UE processing time from PDCCH reception until UL transmission.Timeline condition #2 aims to allow UL transmission after T₂ from thelast (OFDM) symbol of PDCCH(s) (which schedules the UL transmission onone or more of the overlapped PUCCH(s)). Timeline condition #2 also aimsto indicate whether any UL transmission is scheduled before T₂ from thestart of the UL transmission. Therefore, the PDCCH(s) (which schedulesthe UL transmission on one or more of the overlapped PUCCH(s)) should becompletely received before T₂ from the earliest UL resource among theoverlapped PUCCH resource(s). That is, timeline condition #2 may be acondition for starting the first (OFDM) symbol of the (time-domain)earliest of the overlapped PUCCH resources in the slot (and a (single)PUCCH resource selected according to a specific rule on the assumptionthat UCIs are multiplexed) after T₂ from the last (OFDM) symbol of(scheduling) DCI.

[Proposed method #1B] If PUCCH resource(s) and PUSCH resource(s)configured for/indicated to a UE overlap with each other over all orpart of OFDM symbols on the time axis in a slot, the UE performs UCImultiplexing according to the following UCI multiplexing rule.

(1) If the PUCCH resource(s) and PUSCH resource(s) overlapped in theslot satisfy all or part of the following conditions, the UE multiplexesUCI(s) and UL-SCH TB(s) for the overlapped PUCCH resource(s) and PUSCHresource(s) and transmits the multiplexed UCI and UL-SCH in a singlePUSCH resource (hereinafter, referred to as MUX PUSCH).

A. Condition #1

i. Opt. 1: if UCI(s) for the overlapped PUCCH resource(s) in the slot ismultiplexed (if there is a PUCCH resource for HARQ-ACK transmissionamong the overlapped PUCCH resource(s) in the slot,) the first (OFDM)symbol of a (single) PUSCH resource to carry the multiplexed UCI startsafter T₁ from the last (OFDM) symbol of (each of) PDSCH(s) for anHARQ-ACK and/or SPS PDSCH release(s).

ii. Opt. 2: (If there is a PUCCH resource for HARQ-ACK transmissionamong the overlapped PUCCH resource(s) in the slot,) the first (OFDM)symbol of the slot (or the first (OFDM) symbol allowed for ULtransmission in the slot) of the slot starts after T₁ from the last(OFDM) symbol of (each of) PDSCH(s) corresponding to an HARQ-ACK (or SPSPDSCH release(s)).

iii. Opt. 3: (If there is a PUCCH resource for HARQ-ACK transmissionamong the overlapped PUCCH resource(s) in the slot,) the first (OFDM)symbol of the (time-axis) earliest of the overlapped PUCCH resource(s)and PUSCH resource(s) in the slot starts after T₁ from the last (OFDM)symbol of (each of) PDSCH(s) corresponding to an HARQ-ACK (or SPS PDSCHrelease(s)).

iv. Opt. 4: (Ife there is a PUCCH resource for HARQ-ACK transmissionamong the overlapped PUCCH resource(s) in the slot,) the first (OFDM)symbol of the (time-axis) earliest UL transmission resource of (all)PUCCH resource(s) configured for any UCI combination/UCI payload for theUE in the slot and (all) PUSCH resource(s) in the slot starts after T₁from the last (OFDM) symbol of (each of) PDSCH(s) corresponding to anHARQ-ACK (or SPS PDSCH release(s)).

B. Condition #2

i. Opt. 1: (If there is a PUCCH resource for transmission, indicated byDCI, among the overlapped PUCCH resource(s) in the slot,) the first(OFDM) symbol of the (time-axis) earliest UL transmission resource amongthe overlapped PUCCH resource(s) and PUSCH resource(s) in the slotstarts after T₂ from the last (OFDM) symbol of the (scheduling) DCI.

ii. Opt. 2: (If there is a PUCCH resource for transmission, indicated byDCI, among the overlapped PUCCH resource(s) in the slot,) the first(OFDM) symbol of the (time-axis) earliest UL transmission resource among(all) PUCCH resource(s) and (all) PUSCH resource(s) configured for anyUCI combination/UCI payload in the slot, for the UE starts after T₂ fromthe last (OFDM) symbol of the (scheduling) DCI.

iii. Opt. 3: (If there is a PUCCH resource for transmission, indicatedby DCI, among the overlapped PUCCH resource(s) in the slot,) the first(OFDM) symbol of the slot (or the first (OFDM) symbol allowed for ULtransmission in the slot) starts after T₂ from the last (OFDM) symbol ofthe (scheduling) DCI.

Herein, a (scheduling) DCI-based PUCCH resource may be a PUCCH resourcecarrying an HARQ-ACK, allocated by DCI. The last symbol of DCI may bethe last symbol in which a PDCCH carrying the DCI is transmitted.

(2) If (part of) the overlapped PUCCH resource(s) and/or (part) of PUSCHresource(s) in the slot do not satisfy the above condition(s), the UEmay perform the following operations.

A. Opt. 1: The UE does not expect the case of (2). If the case of (2)occurs, the UE operates according to UE implementation.

B. Opt. 2: The UE drops transmission of UCI(s) corresponding to (part)of the PUCCH resource(s) and/or transmission of a UL-SCH TBcorresponding to (part) of the PUSCH resource(s), which do not satisfythe condition(s) of (1). On the other hand, the UE multiplexes UCI(s)and/or UL-SCH(s) for the remaining PUCCH resource(s) and/or theremaining PUSCH resource(s), which satisfy the condition(s) of (1), andtransmits the multiplexed UCI and UL-SCH in a single PUCCH resource, ora single PUSCH resource (if there is any overlapped PUSCH resourcesatisfying the condition(s) of (1)).

C. Opt. 3: Transmission of the overlapped PUCCH resource(s) and/or PUSCHresource(s) in the slot is dropped.

D. Opt. 4: Only a specific (one) PUCCH or PUSCH resource (e.g., a ULresource carrying UCI of a highest priority or an earliest UL resourceon the time axis) (among the overlapped PUCCH resource(s) and/or PUSCHresource(s) in the slot) is transmitted, while transmission of the otherPUCCH or PUSCH resources is dropped.

However, on the assumption that UCI(s) for overlapped PUCCH resource(s)(of which the transmission is indicated by higher-layer signaling (e.g.,RRC signaling) and/or DCI) in a slot is multiplexed, a new (single)PUCCH resource (MUX PUCCH) to carry the multiplexed UCI may bedetermined according to a specific rule determined based on a UCIcombination (to be multiplexed), a (total) UCI payload size, and so on.

T₁ may be a value corresponding to a UE processing time required totransmit an HARQ-ACK after the UE receives a PDSCH. Further, T₂ is avalue corresponding to a UE processing time required to perform ULtransmission after the UE receives (scheduling) DCI. T₁ and T₂ may berepresented in (OFDM) symbols.

When the UE determines whether to multiplex UCI between PUCCHresource(s) and PUSCH resource(s) overlapped on the time axis, the UEmay consider at least two timeline conditions. Timeline condition #1 isintended to ensure a UE processing time from PDSCH reception untilHARQ-ACK transmission. Timeline condition #1 aims to allow transmissionof an HARQ-ACK after a predetermined time T₁ from the last (OFDM) symbolof PDSCH(s) corresponding to the HARQ-ACK. Therefore, the conditionbased on T₁ should be applied based on a UL resource carrying theHARQ-ACK. If overlapped UCIs are multiplexed, the condition based on T₁may be applied between the starting time of a PUCCH resource or PUSCHresource determined (according to a specific rule) and the last (OFDM)symbol of PDSCH(s) corresponding to the HARQ-ACK. Timeline condition #2is intended to ensure a UE processing time from PDCCH reception until ULtransmission. Timeline condition #2 aims to allow UL transmission aftera predetermined time T₂ from the last (OFDM) symbol of PDCCH(s) (whichschedules UL transmission on one or more of the overlapped PUCCH(s)).Timeline condition #2 also aims to indicate whether any UL transmissionis scheduled before T₂ from the start of the UL transmission. Therefore,the PDCCH(s) (which schedules UL transmission on one or more of theoverlapped PUCCH(s)) should be completely received before T₂ from theearliest UL resource among the overlapped PUCCH resource(s). That is,timeline condition #2 may be a condition for starting the first (OFDM)symbol of the (time-axis) earliest of the overlapped PUCCH resources andPUSCH resource(s) in the slot after T₂ from the last (OFDM) symbol ofthe (scheduling) DCI.

[Proposed method #1D] If a (single) SR PUCCH resource in a slot,(semi-statically) configured for/indicated to the UE overlaps with twoor more (semi-statically configured) CSI PUCCHs on the time axis, the UEperforms one of the following operations.

(1) Opt. 1: CSI and an SR are multiplexed and transmitted by adding allof SR bit(s) to the UCI payload of each CSI PUCCH resource. That is, SRinformation may be loaded on all CSI PUCCHs overlapped with the SRPUCCH.

-   -   SR information(s) loaded in a plurality of CSI PUCCH resources        may be a copy of SR information transmitted in the first CSI        PUCCH resource. That is, the SR information loaded on the        plurality of CSI PUCCH resources may be the same duplicates.        Further, the SR information loaded on the plurality of CSI PUCCH        resources may be SR information updated for each CSI PUCCH        resource (or, reflecting the SR state of the UE (e.g., negative        or positive) at each CSI PUCCH time). That is, the SR        information loaded on the plurality of CSI PUCCH resources may        be SR information updated at each transmission time of a CSI        PUCCH resource.

(2) Opt. 2: The CSI and the SR are multiplexed and transmitted by addingthe SR bit(s) only to the UCI payload of a specific single CSI PUCCHresource. The specific single CSI PUCCH resource may be one of thefollowings.

-   -   Opt. 2-1: The first (or last) CSI PUCCH resource on the time        axis or a CSI PUCCH resource having the earliest (or latest)        starting time. That is, the SR information may be loaded only on        the first of all CSI PUCCHs overlapped with the SR PUCCH.    -   Opt. 2-2: A CSI PUCCH resource having a largest transmission        capacity.    -   Opt. 2-3: A CSI PUCCH resource configured for CSI having a        highest priority.

In the NR system, in the case where a single CSI PUCCH resource overlapswith one or more SR PUCCH resource in one slot, an operation ofmultiplexing all UCIs and transmitting the multiplexed UCI in a singleCSI PUCCH resource is under consideration. Regarding multiplexingbetween CSI and an SR, a UCI multiplexing rule should also be set forthe case where a single SR PUCCH resource overlaps with a plurality ofCSI PUCCH resources, unlike the above case. The foregoing proposedoptions may be considered in regard to the issue.

[Proposed method #1E] If a (single) AN PUCCH resource in a slot,configured for/indicated to the UE overlaps with two or more(semi-statically configured) CSI PUCCHs on the time axis, the UEperforms one of the following operations.

(1) Case in which the AN PUCCH resource is scheduled based on DCI.

A. Opt. 1: A CSI report for a specific one of the CSI PUCCH resource(s)overlapped with the AN PUCCH resource may be multiplexed with anHARQ-ACK and transmitted in a (single) PUCCH resource. For example, thespecific one CSI PUCCH resource includes a CSI PUCCH resource which isearliest on the time axis or configured/corresponding for/to CSI of ahighest priority.

i. The (single) PUCCH resource carrying the multiplexed UCI may beselected from among PUCCH resources configured for HARQ-ACK transmission(based on DCI and a total UCI payload size). For example, a PUCCHresource may be selected based on DCI and a total UCI payload size asfollows. The UE may first select one of the following PUCCH resourcesets according to the total number of UCI payload bits, N_(UCI).

-   -   PUCCH resource set #0, if the number of UCI bits≤2    -   PUCCH resource set #1, if 2<the number of UCI bits≤N₁    -   PUCCH resource set #(K−1), if N_(K−2)<the number of UCI        bits≤N_(K−1)

K represents the number of PUCCH resource sets (K>1) and N_(i)represents a maximum number of UCI bits supported by PUCCH resource set#i. For example, PUCCH resource set #1 may include resources of PUCCHformat 0 to PUCCH format 1, and the other PUCCH resource sets mayinclude resources of PUCCH format 2 to PUCCH format 4 (see Table 5). APUCCH resource of the selected PUCCH resource set, to be used for UCItransmission may be indicated by an ARI in the DCI.

ii. Transmissions of the other CSI PUCCHs than the specific CSI PUCCHand CSI reports corresponding to the other CSI PUCCHs may be skipped.

B. Opt. 2: All of CSI report(s) for the CSI PUCCH resource(s) overlappedwith the AN PUCCH resource or only up to M high-priority ones of the CSIreport(s) according to a predefined/preconfigured priority rule may bemultiplexed with an HARQ-ACK and transmitted in a (single) PUCCHresource.

i. M may be 1 or 2.

ii. M may be a pre-agreed value or a value configured/defined based on ahigher-layer signal.

iii. The (single) PUCCH resource carrying the multiplexed UCI may beselected from among PUCCH resources configured for HARQ-ACK transmission(based on DCI and a total UCI payload size).

(2) Case in which an AN PUCCH resource is semi-statically configured(i.e., the AN PUCCH resource is not scheduled based on DCI) (e.g., an ANfor a SPS PDSCH).

A. Opt. 1: An HARQ-ACK and a CSI report are multiplexed for each of CSIPUCCH resources overlapped with the AN PUCCH resource, and transmittedin the CSI PUCCH resource.

B. Opt. 2: An HARQ-ACK and a CSI report are multiplexed for a specificone of the CSI PUCCH resources overlapped with the AN PUCCH resource andtransmitted in the specific CSI PUCCH resource. For example, thespecific one CSI PUCCH resource includes a PUCCH resource which isearliest on the time axis or is configured for CSI of a highestpriority.

Herein, an AN PUCCH resource refers to a PUCCH resource for HARQ-ACKtransmission.

Herein, a CSI PUCCH resource refers to a PUCCH resource for CSItransmission.

Because the NR system supports a flexible PUCCH transmission periodconfiguration, a single AN PUCCH resource and one or more CSI PUCCHresources may overlap with each other in one slot. If the AN PUCCHresource is scheduled based on DCI, UCI in which an HARQ-ACK ismultiplexed with CSI may be transmitted in a PUCCH resource selectedfrom among PUCCH resources configured for HARQ-ACK transmission. In thiscase, because a relatively large UCI payload size range is supported, anoperation of multiplexing and transmitting an HARQ and a plurality ofCSI reports for a predetermined plural number of CSI PUCCH resources (ofhigh priority) based on a priority rule may be supported. The maximumnumber of CSI reports allowed to be multiplexed with an HARQ-ACK may belimited by higher-layer signaling (RRC signaling). Alternatively, asimple method of multiplexing and transmitting an HARQ-ACK and only aCSI report for the first one of CSI PUCCH resources overlapped with anAN PUCCH resource on the time axis may be considered. If an AN PUCCHresource (e.g., for a SPS PDSCH) is semi-statically configured byhigher-layer signaling (RRC signaling), UCI in which an HARQ-ACK ismultiplexed with CSI may be transmitted in a CSI PUCCH resource. In thiscase, for each of the CSI PUCCH resource(s) overlapped with the AN PUCCHresource, an HARQ-ACK and CSI are multiplexed and transmitted in the CSIPUCCH resource (i.e., repeated transmissions from the viewpoint of theHARQ-ACK). Alternatively, for the first of the CSI PUCCH resource(s)overlapped with the AN PUCCH resource, an HARQ-ACK and CSI aremultiplexed and transmitted in the first CSI PUCCH resource.

[Proposed method #1F] If a (single) PUSCH resource configuredfor/indicated to a UE overlaps with two or more CSI PUCCH resources (orAN PUCCH resources) on the time axis in a slot, the UE performs one ofthe following operations.

(1) Opt. 1: A CSI report (or HARQ-ACK information) for a specific oneCSI PUCCH resource (or AN PUCCH resource) among CSI PUCCH resource(s)(or AN PUCCH resource(s)) overlapped with a PUSCH is multiplexed with aUL-SCH TB (e.g., UL data) and transmitted in a PUSCH resource (e.g., UCIpiggyback).

-   -   The specific single CSI PUCCH resource may include a CSI PUCCH        resource configured for CSI which is earliest on the time axis        or has a highest priority. Further, the specific single CSI        PUCCH resource may include an earliest An PUCCH resource on the        time axis.    -   Transmission of the remaining CSI PUCCHs (or AN PUCCHs) other        than the specific single CSI PUCCH resource (or AN PUCCH        resource) and a corresponding CSI report (or HARQ-ACK) may be        dropped.

(2) Opt. 2: All of CSI report(s) (or HARQ-ACK information) for CSI PUCCHresource(s) (or AN PUCCH resource(s)) overlapped with a PUSCH ismultiplexed with a UL-SCH TB (e.g., UL data) and transmitted in thePUSCH resource (e.g., UCI piggyback). Alternatively, up to M CSI reportswith higher priorities selected from among the CSI report(s) (orHARQ-ACK information) for the CSI PUCCH resource(s) (or AN PUCCHresource(s)) overlapped with the PUSCH in a predefined/preconfiguredpriority rule are multiplexed with the UL-SCH TB (e.g., UL data) andtransmitted in the PUSCH resource (e.g., UCI piggyback).

-   -   M may be 1 or 2.    -   M may be preset or configured/defined by higher-layer signaling        (or RRC signaling).

If a PUSCH resource is replaced with a CSI PUCCH resource and a UL-SCHTB is replaced with CSI in [proposed method #1F], a CSI multiplexingoperation for a CSI PUCCH resource and an AN PUCCH resource may beperformed in the same manner.

Since the NR system supports a flexible PUCCH transmission periodconfiguration, it may occur that a single PUSCH resource overlaps withone or more CSI PUCCH resources (or AN PUCCH resources) in one slot. Inthis case, only M CSI report(s) for M (higher-priority) CSI PUCCHresource(s) based on a priority rule may be UCI-piggybacked to thePUSCH. M may be preset or configured/defined by higher-layer signaling(or RRC signaling). Or simply, only a CSI report (or HARQ-ACK) for thefirst CSI PUCCH resource (or AN PUCCH resource) overlapped with thePUSCH resource on the time axis may be UCI-piggybacked to the PUSCH.

[Proposed method #1G] An operation of limiting the number of (TDMed)PUCCH transmissions in a slot is under consideration in the NR system.Accordingly, there is a need for defining a UE operation, when aplurality of PUCCH transmissions in one slot are indicated/configured.

For example, when a UE is allowed to transmit up to M (e.g., M=2)(TDMed) PUCCH resource(s) in one slot, transmission of N (N>M) (TDMed)(non-overlapped) PUCCH resource(s) in a specific slot may be configuredfor and/or indicated to the UE. The N (TDMed) PUCCH resource(s) refersto/includes PUCCH resource(s) which are not overlapped on the time axis.In this case, the UE may transmit M or fewer (TDMed) PUCCH resource(s)in the slot in one of the following methods. Herein, transmission of aPUCCH resource may mean/include transmission of UCI in the PUCCHresource.

(1) Method #1: M or fewer (TDMed) high-priority PUCCH resource(s) in theslot are selected according to priority rule(s) and transmitted.

A. One or more of the following priority rules may be applied.

i. Priority rule #1: prioritization based on scheduling methods.

-   -   PUCCH resource indicated for UCI transmission by DCI (e.g.,        PUCCH resource indicated by an ARI)>PUCCH resource configured by        higher-layer signaling (e.g., RRC signaling) (e.g., AN PUCCH        resource for a SPS PDSCH, PUCCH resource for periodic CSI        reporting, and so on).

ii. Priority rule #2: prioritization based on PUCCH formats.

-   -   Short PUCCH (e.g., PUCCH format 0/2)>Long PUCCH (e.g., PUCCH        format 1/3/4)

iii. Priority rule #3: prioritization based on UCI types.

-   -   PUCCH resource carrying HARQ-ACK>PUCCH resource carrying SR        (without HARQ-ACK)>PUCCH resource carrying CSI (without        HARQ-ACK/SR)    -   One thing to note herein is that in the presence of a plurality        of (TDMed) PUCCH resources for the same UCI type, a PUCCH        resource corresponding to a report of a high priority according        to a (pre-agreed) priority rule for a plurality of reports for        the same UCI type may have a high priority (from the viewpoint        of selection of M PUCCH resources). That is, in the presence of        a plurality of PUCCH resources corresponding to a plurality of        UCIs (e.g., CSIs) of the same type, the priority of each PUCCH        resource is based on the priority of corresponding UCI.

The priorities of CSI reports may be determined based on at least one ofthe types of the CSI reports (e.g., aperiodic CSI report, semi-staticCSI report, and periodic CSI report), physical channels carrying the CSIreports, the contents (e.g., Layer-1 received signal received powers(L1-RSRPs)) of the CSI reports, the indexes of cells related to the CSIreports, IDs related to the CSI reports, or the maximum number of CSIreport configurations. For example, the priority levels of CSI reportsin an NR system publicized before the priority date of the presentdisclosure are defined as follows (3GPP 38.214 Rel-15.1.0, 5.2.5“Priority rules for CSI reports”; 2018-03).

Pri_(CSI)(y,k,c,s)=2*16*M _(s) *y+16*M _(s) *k+M _(s) *c+s  [Equation 1]

-   -   For transmission of an aperiodic CSI report on a PUSCH, y=0, for        transmission of a semi-static CSI report on a PUSCH, y=1, for a        semi-static CSI report on a PUCCH, y=2, and for transmission of        a periodic CSI report on a PUCCH, y=4.    -   For a CSI report carrying an L1-RSRP, k=0, and for a CSI report        that does not carry an L1-RSRP, k=1.    -   c represents the index of a serving cell.    -   s represents an ID (e.g., ReportConfigID) related to a CSI        report configuration.    -   Ms is the maximum number of CSI report configurations configured        by higher-layer signaling.

As the value of Pri_(CSI)(y,k,c,s) is smaller, the priority is higher.

Iv. Priority rule #4: prioritization based on transmission order.

-   -   PUCCH resource earlier in transmission order on the time        axis>PUCCH resource later in transmission order on the time axis        (with respect to a starting or ending OFDM symbol).

In the above priority rules, the left of the inequality sign representsa higher priority.

When M (TDMed) PUCCHs are transmitted in one slot, at least one PUCCHresource may be in PUCCH format Y. PUCCH format Y includes a PUCCHresource of a short symbol duration (e.g., one or two symbols). Forexample, PUCCH format Y may include PUCCH format 0/2 (or Short PUCCH).On the other hand, PUCCH format X includes a PUCCH resource of a longsymbol duration (e.g., 4 to 14 symbols). For example, PUCCH format X mayinclude PUCCH format 1/3/4 (or Short PUCCH).

When M (TDMed) PUCCHs are transmitted in one slot, at least one PUCCHresource (e.g., S PUCCH resources) is in PUCCH format Y. Therefore, thenumber of PUCCH resources of PUCCH format X allowed to be transmitted inone slot may be limited to L (<M) at maximum (e.g., L=M−S). Accordingly,when the number of PUCCH resources of PUCCH format X has reached Lduring priority rule(s)-based PUCCH resource(s) selection, the UE mayperform a PUCCH resource selection procedure according to priorityrule(s) for the remaining PUCCH resource(s) except for the PUCCHresource(s) of PUCCH format X in order to select a PUCCH resource of thenext priority. On the contrary, when the number of PUCCH resources ofPUCCH format X has not reached L, the UE may perform the PUCCH resourceselection procedure according to the priority rule(s) for the remainingPUCCH resource(s) including PUCCH resource(s) of PUCCH format X in orderto select a PUCCH resource of the next priority. If M=2, S=1 and L=1.

For example, transmission of only two high-priority PUCCH resourcesamong (TDMed) PUCCH resources in a slot may be allowed (i.e., M=2). Ifthe PUCCH format of the highest-priority PUCCH resource is Long PUCCH(e.g., PUCCH format 1/3/4), the second highest-priority PUCCH resourcemay be selected only from among the remaining PUCCH resource(s) (i.e.,Short PUCCH resource(s)) (e.g., PUCCH format 0/2) except for Long PUCCHresources. If the PUCCH format of the highest-priority PUCCH resource isShort PUCCH (e.g., PUCCH format 0/2), the second highest-priority PUCCHresource may be selected from among the remaining PUCCH resource(s)including Long PUCCH resources. Therefore, a PUCCH resource set fromwhich the second highest-priority PUCCH resource is selected may bedifferent according to the PUCCH format of the highest-priority PUCCHresource. If the PUCCH format of the highest-priority PUCCH resource isLong PUCCH and the PUCCH formats of all of the remaining PUCCHresource(s) except for the highest-priority PUCCH resource are LongPUCCH, the UE may transmit only the highest-priority PUCCH resource inthe slot.

In a specific example, there are an AN PUCCH resource of PUCCH format 1,a CSI PUCCH resource of PUCCH format 2, and an SR PUCCH resource ofPUCCH format 1 in one slot. According to a priority rule, the AN PUCCHresource may be selected as a highest-priority PUCCH resource. Becauseonly up to one Long PUCCH format (=PUCCH format 1/3/4) is allowed in oneslot, the CSI PUCCH resource of PUCCH format 2 (Short PUCCH) may beselected as the second highest-priority PUCCH resource. If the AN PUCCHresource is in a Short PUCCH format in the above example, the secondhighest-priority PUCCH resource may be either of Long PUCCH or ShortPUCCH. Accordingly, the SR PUCCH resource of PUCCH format 1 (Long PUCCH)may be selected as the second highest-priority PUCCH resource.

In another specific example, there are a CSI #1 PUCCH resource of PUCCHformat 1, a CSI #2 PUCCH resource of PUCCH format 2, and a CSI #3 PUCCHresource of PUCCH format 1 in one slot. It is assumed that thepriorities of CSI reports are in the order of CSI #1>CSI #3>CSI #2.According to the priority rule, the CSI #1 PUCCH resource may beselected as the highest-priority PUCCH resource. Because only up to oneLong PUCCH format (=PUCCH format 1/3/4) is allowed in one slot, the CSI#2 PUCCH resource of PUCCH format 2 (Short PUCCH) may be selected as thesecond highest-priority PUCCH resource. If the CSI #1 PUCCH resource isin a Short PUCCH format in the above example, the secondhighest-priority PUCCH resource may be either of Long PUCCH or ShortPUCCH. Accordingly, the CSI #3 PUCCH resource of PUCCH format 1 (LongPUCCH) may be selected as the second highest-priority PUCCH resource.

FIG. 12 illustrates an exemplary procedure of transmitting controlinformation according to “priority rule #3: prioritization based on UCItypes” in Method #1. The example of FIG. 12 is based on the assumptionthat transmission of only two high-priority PUCCH resources among(TDMed) PUCCH resources in a slot is allowed.

Referring to FIG. 12, a UE (or an eNB) may determine first UCI of ahighest priority from among a plurality of UCIs, wherein the pluralityof UCIs may correspond to a plurality of non-overlapped resources in thesame time duration (S1202). Each of the UCIs corresponds to a PUCCHresource, and the priorities of PUCCH resources are based on thepriorities of their corresponding UCIs. Subsequently, the UE (or theeNB) may determine second UCI of a highest priority in a UCI set, basedon the format of a PUCCH resource corresponding of the first UCI(S1204). The UE may then transmit the first UCI and the second UCI intheir corresponding PUCCH resources (S1206), and the eNB may receive thefirst UCI and the second UCI in the corresponding PUCCH resources.

When the PUCCH resource corresponding to the first UCI is in a firstformat, the UCI set may include all of the remaining UCIs except for thefirst UCI among the plurality of UCIs. On the other hand, when the PUCCHresource corresponding to the first UCI is in a second format, the UCIset may include only one or more UCIs corresponding to PUCCH resourcesof the first format among the remaining UCIs except for the first UCIamong the plurality of UCIs. That is, the UCI set may include only theremaining UCIs except for UCI(s) corresponding to PUCCH resources of thesecond format, among the remaining UCIs except for the first UCI amongthe plurality of UCIs.

A PUCCH resource of the first format may have a shorter duration than apredetermined value (Short PUCCH). For example, the PUCCH resource ofthe first format may last for one to two symbol duration. For example,the first format includes PUCCH format 0/2. In contrast, a PUCCHresource of the second format may have a longer duration than thepredetermined value (Long PUCCH). For example, the PUCCH resource of thesecond format may last for four or more (e.g., 4 to 14) symbol duration.For example, the first format includes PUCCH format 1/3/4. Herein, asymbol may be an OFDM-based symbol such as a CP-OFDM or DFT-s-OFDMsymbol.

Further, the plurality of UCIs may be of the same UCI type. The same UCItype may be A/N, CSI, or SR.

Further, when the PUCCH resource corresponding to the first UCI is LongPUCCH and all of PUCCH resource(s) corresponding to the remaining UCI(s)except for the first UCI among the plurality of UCIs are Long PUCCH,only the first UCI may be transmitted in the corresponding slot.

Further, the communication device may be a device used for aself-driving vehicle.

(2) Method #2: M or fewer (TDMed) PUCCH resource(s) are transmitted in aslot by multiplexing UCI(s) for a part of N (TDMed) PUCCH resource(s)and transmitting the multiplexed UCI in a single PUCCH resource.

A. For example, M high-priority (TDMed) PUCCH resource(s) in the slotmay be selected according to priority rule(s) (see Method #1).Subsequently, UCI(s) for the remaining PUCCH resource(s) may bemultiplexed and transmitted on the assumption of overlap with the lastof the selected M (TDMed) PUCCH resource(s).

[Proposed method MI] When the UE performs UCI multiplexing for an ANPUCCH resource (for an AN of 2 or fewer bits) and N (e.g., N>1) SR PUCCHresources, a method of scheduling an AN PUCCH and/or a method ofdifferentiating a PUCCH format to carry multiplexed UCI (e.g., AN/SR)according to the number K of PUCCH resource sets configured for an ANPUCCH are given as follows.

(1) Case in which the AN PUCCH resource is indicated by DCI (e.g., ARI),

A. If K>1,

-   -   the multiplexed UCI (e.g., AN/SR) is transmitted in one of PUCCH        formats 2, 3 and 4.

B. If K=1,

-   -   the multiplexed UCI (e.g., AN/SR) is transmitted in one of PUCCH        formats 0 and 1.

(2) Case in which the AN PUCCH resource is not indicated by DCI (e.g.,ARI) (e.g., the AN PUCCH resource is associated with A/N information foran SPS PDSCH),

A. If K>1,

-   -   Opt. 1: the multiplexed UCI (e.g., AN/SR) is transmitted in one        of PUCCH formats 0 and 1.    -   Opt. 2: the multiplexed UCI (e.g., AN/SR) is transmitted in one        of PUCCH formats 2, 3 and 4, selected on the assumption of a        specific ARI value.

B. If K=1,

-   -   the multiplexed UCI (e.g., AN/SR) is transmitted in one of PUCCH        formats 0 and 1.

According to the foregoing method, when an AN PUCCH resource overlapswith N (N>1) SR PUCCH resources, the UE may multiple an AN with an SR.

The UE may select a PUCCH resource set according to a (total) UCIpayload size, and then transmit UCI (e.g., HARQ-ACK) in a PUCCH resourceindicated by an ARI among PUCCH resources of the selected PUCCH resourceset. The ARI (ACK/NACK resource indicator) is a bit field in DCI,indicating a PUCCH resource.

There may be a plurality of PUCCH resource sets (K>1) for AN PUCCHresources. In this case, the UE may multiplex the AN and other UCI andthen select a PUCCH resource set corresponding to the (total) size ofmultiplexed UCI payload. Then, the UE may transmit the multiplexed UCIin a PUCCH resource indicated by the ARI among PUCCH resources of theselected PUCCH resource set. If the PUCCH resource set supports a UCIsize of 2 or fewer bits, the PUCCH resource set may include PUCCH format0/1. If the PUCCH resource set supports a UCI size of 3 or more bits,the PUCCH resource set may include PUCCH format 2/3/4. If there are oneor more PUCCH resource sets, at least one PUCCH resource set isconfigured for transmission of UCI with 2 or fewer bits. Therefore, ifan AN PUCCH resource is indicated by an ARI and there are two or morePUCCH resource sets for the AN PUCCH resource, the UE may transmit UCIin PUCCH format 2/3/4 configured for transmission of UCI with 3 or morebits. In this case, when the UE multiplexes an AN and a plurality ofSRs, the UE appends multi-bit SR information for a plurality of SR PUCCHresources to AN payload, and then transmit the multiplexed AN/SR in oneof PUCCH formats 2, 3 and 4, indicated by the ARI, within a PUCCHresource set selected based on the total UCI payload size.

However, even though an AN PUCCH resource is indicated by an ARI, ifthere is one PUCCH resource set for the AN PUCCH resource, the UE maynot use a PUCCH format 2/3/4 resource. Therefore, a method oftransmitting multiplexed AN/SR in a PUCCH format 0/1 resource may beconsidered. For example, when the UE multiplexes an AN and a pluralityof SRs, if an AN PUCCH is in PUCCH format 1, the UE may drop SRtransmission in SR PUCCH resource(s) of PUCCH format 0, whiletransmitting an AN in an SR PUCCH resource corresponding to a positiveSR with a highest priority among SR PUCCH resource(s) of PUCCH format 1(however, if all SRs are negative SRs, the AN PUCCH is transmitted). Or,if the AN PUCCH is in PUCCH format 0, SR information for two SR PUCCHs(SR PUCCH groups) may be represented by applying up to two CS offsets tothe AN PUCCH resource. That is, a CS offset corresponding to ahighest-priority SR PUCCH (group) including at least one SR PUCCH for apositive SR may be applied to AN PUCCH format 0.

An AN PUCCH resource corresponding to SPS PDSCH transmission may beconfigured semi-statically by higher-layer signaling (e.g., RRCsignaling), not indicated by an ARI. Therefore, if an AN PUCCH resourcecorresponding to SPS PDSCH transmission overlaps with an SR PUCCHresource, the UE may not use PUCCH format 2/3/4 when multiplexing an ANand a plurality of SRs. Therefore, a method of transmitting multiplexedAN/SR in a PUCCH format 0/1 resource. For example, when the UEmultiplexes an AN and a plurality of SRs, if an AN PUCCH is in PUCCHformat 1, the UE may drop SR transmission in SR PUCCH resource(s) ofPUCCH format 0, while transmitting the AN in an SR PUCCH resourcecorresponding to a positive SR with a highest priority among SR PUCCHresource(s) of PUCCH format 1 (however, if all SRs are negative SRs, theAN PUCCH is transmitted). Or, if the AN PUCCH is in PUCCH format 0, SRinformation for two SR PUCCHs (SR PUCCH groups) may be represented byapplying up to two CS offsets to the AN PUCCH resource. That is, a CSoffset corresponding to a highest-priority SR PUCCH (group) including atleast one SR PUCCH for a positive SR may be applied to AN PUCCH format0. However, if there are two or more PUCCH resource sets for the ANPUCCH resource, the UE may assume a specific ARI value (e.g., ARI=0) todetermine an AN PUCCH resource, although the ARI does not indicate.Subsequently, the UE may (1) represent SR information for a plurality ofSR PUCCH resources as multi-bit SR information and add the multi-bit SRinformation to AN payload, and then (2) transmit the multiplexed AN/SRin one of PUCCH format 2/3/4 resources corresponding to ARI=0 in a PUCCHresource set selected based on the total size of the multiplexed UCIpayload.

In regard to the operation of “transmitting multiplexed UCI (e.g.,AN/SR) in one of PUCCH formats 0 and 1” in [proposed method #1H], the UEmay multiplex an AN and an SR as follows. Notably, PF0/1/2/3/4represents PUCCH format 0/1/2/3/4.

(1) Case #1: UCI multiplexing between (single) AN and (single) SR

A. AN PF0

i. SR PF0: In the case of a positive SR, the AN is transmitted in aresource resulting from applying a CS offset to an AN PF0 resource. Inthe case of a negative SR, the AN is transmitted in the AN PF0 resource.

ii. SR PF1

-   -   Opt. 1: In the case of a positive SR, the AN is transmitted in a        resource resulting from applying a CS offset to an AN PF0        resource. In the case of a negative SR, the AN is transmitted in        the AN PF0 resource.    -   Opt. 2: In the case of a positive SR, the AN is transmitted in        an SR PF1 resource. In the case of a negative SR, the AN is        transmitted in an AN PF0 resource.

B. AN PF1

i. SR PF0: The AN is transmitted in an AN PF1 resource (SR drop)

ii. SR PF1: In the case of a positive SR, the AN is transmitted in an SRPF1 resource. In the case of a negative SR, the AN is transmitted in anAN PF1 resource.

(2) Case #2: UCI multiplexing between (single) AN and (multiple) SRs(w/single PUCCH format)

A. AN PF0

i. (Multiple) SR PF0

-   -   If SR information for at least one SR PUCCH (in a specific SR        PUCCH group) is a positive SR, the AN is transmitted in a        resource resulting from applying a CS offset (corresponding to        the specific SR PUCCH group) to an AN PF0 resource.    -   In this case, a total of K SR PUCCHs are grouped into L (e.g.,        L=2, K>L) SR PUCCH groups, and then the respective L SR PUCCH        groups may be mapped to L different CS offsets. If at least one        of SRs in a specific SR PUCCH group is positive, the AN is        transmitted in a resource to which a CS offset corresponding to        the specific SR PUCCH group is applied.    -   If SR information for all SR PUCCH(s) is a negative SR, the AN        is transmitted in an AN PF0 resource.

ii. (Multiple) SR PF1

-   -   Opt. 1: If SR information for at least one SR PUCCH (in a        specific SR PUCCH group) is a positive SR, the AN is transmitted        in a resource resulting from applying a CS offset (corresponding        to the specific SR PUCCH group) to an AN PF0 resource. In this        case, a total of K SR PUCCHs are grouped into L (e.g., L=2, K>L)        SR PUCCH groups, and then the respective L SR PUCCH groups may        be mapped to L different CS offsets. If at least one of SRs in        the specific SR PUCCH group is positive, the AN is transmitted        in a resource to which the CS offset corresponding to the        specific SR PUCCH group is applied. If SR information for all of        the SR PUCCH(s) is a negative SR, the AN is transmitted in an AN        PF0 resource.    -   Opt. 2: If SR information for at least one SR PUCCH is a        positive SR, the AN is transmitted in an SF PF1 resource        corresponding to a (highest-priority) SR PUCCH among SR PUCCHs.        If SR information for all of the SR PUCCH(s) is a negative SR,        the AN is transmitted in an AN PF0 resource.

B. AN PF1

i. (Multiple) SR PF0: The AN is transmitted in an AN PF1 resource (SRdrop).

ii. (Multiple) SR PF1: If SR information for at least one SR PUCCH is apositive SR, the AN is transmitted in an SR PF1 resource correspondingto a (highest-priority) SR PUCCH among SR PUCCHs. If SR information forall of the SR PUCCH(s) is a negative SR, the AN is transmitted in an ANPF1 resource.

(3) Case #3: UCI multiplexing between (single) AN and (multiple) SRs(w/different PUCCH formats)

A. AN PF0

i. (multiple) SR PF0+(multiple) SR PF1

-   -   Opt. 1: if SR information for at least one SR PUCCH is a        positive SR and (a highest-priority) SR PUCCH among SR PUCCHs is        in PF0, the AN is transmitted in a resource resulting from        applying a CS offset to an AN PF0 resource. In this case, a        total of SR PUCCHs or K SR PUCCHs configured with PF0 are        grouped into L (e.g., L=2, K>L) SR PUCCH groups, and then the        respective L SR PUCCH groups may be mapped to L different CS        offsets. If at least one of the SRs of a specific SR PUCCH group        is positive, the AN is transmitted in a resource to which a CS        offset corresponding to the specific SR PUCCH group is applied.        If the number K of the SR PUCCHs configured with PF0 is equal to        or less than L, the respective K SR PUCCHs may be mapped to K        different CS offsets without grouping. In this case, the AN is        transmitted in a resource to which a CS offset corresponding to        a positive SR PUCCH is applied. If SR information for at least        one SR PUCCH is a positive SR and a (highest-priority) SR PUCCH        among the SR PUCCHs is in PF1, the AN is transmitted in a        (corresponding) SR PF1 resource. If SR information for all of        the SR PUCCH(s) is a negative SR, the AN is transmitted in an AN        PF0 resource.    -   Opt. 2: if SR information for at least one SR PUCCH (in a        specific SR PUCCH group) is a positive SR, the AN is transmitted        in a resource resulting from applying a CS offset (corresponding        to the specific SR PUCCH group) to an AN PF0 resource. In this        case, a total of K SR PUCCHs may be grouped into L (e.g., L=2,        K>L) SR PUCCH groups, and the respective L SR PUCCH groups may        be mapped to K different CS offsets. In this case, if at least        one of the SRs in the specific SR PUCCH group is positive, the        AN is transmitted in a resource to which a CS offset        corresponding to the specific SR PUCCH group is applied. If SR        information for all of the SR PUCCH(s) is a negative SR, the AN        is transmitted in an AN PF0 resource.    -   Opt. 3: if SR information for at least one SR PUCCH (in a        specific SR PUCCH group) is a positive SR, the AN is transmitted        in a specific SR PF1 resource (corresponding to the specific SR        PUCCH group). In this case, a total of K SR PUCCHs are grouped        into L (e.g., L is the number of SRs configured with F1, K>L) SR        PUCCH groups, and then the respective L SR PUCCH groups may be        mapped to L different CS offsets. In this case, if at least one        of the SRs in the specific SR PUCCH group is positive, the AN is        transmitted in an SR PF1 resource corresponding to the specific        SR PUCCH group. If SR information for all of the SR PUCCH(s) is        a negative SR, the AN is transmitted in an AN PF0 resource.

B. AN PF1

i. (multiple) SR PF0+(multiple) SR PF1

-   -   Opt. 1: if SR information for at least one SR PUCCH is a        positive SR and (a highest-priority) SR PUCCH among SR PUCCHs is        in PF0, the AN is transmitted in an AN PF1 resource (SR drop).        If SR information for at least one SR PUCCH is a positive SR and        a (highest-priority) SR PUCCH among SR PUCCHs is in PF1, the AN        is transmitted in a (corresponding) SR PF1 resource. If SR        information for all of the SR PUCCH(s) is a negative SR, the AN        is transmitted in an AN PF1 resource.    -   Opt. 2: If SR information for at least one SR PUCCH (in a        specific SR PUCCH group) is a positive SR, the AN is transmitted        in a specific ST PF1 resource (corresponding to the specific SR        PUCCH group). In this case, a total of K SR PUCCHs are grouped        into L (e.g., L is the number of SRs configured with F1, K>L) SR        PUCCH groups, and then the respective L SR PUCCH groups may be        mapped to L different SR F1 resources. In this case, if at least        one of the SRs in the specific SR PUCCH group is positive, the        AN is transmitted in an SR F1 resource corresponding to the        specific SR PUCCH group. If SR information for all of the SR        PUCCH(s) is a negative SR, the AN is transmitted in an AN PF1        resource.

Herein, an SR PUCCH group may include one or more SR PUCCHs, and one ormore SR PUCCH groups may be defined.

The foregoing description is summarized as follows.

(1) Case #1

A. AN PF0+single SR PF0=>AN+SR on AN PF0 (by CS offset)

B. AN PF0+single SR PF1=>AN+SR on AN PF0 (by CS offset) or SR PF1 (by CHselection)

C. AN PF1+single SR PF0=>AN only on AN PF1 (by SR drop)

D. AN PF1+single SR PF1=>AN+SR on SR PF1 (by CH selection)

(2) Case #2

A. AN PF0+multiple SR PF0=>AN+SR on AN PF0 (by CS offset & SR bundling)

B. AN PF0+multiple SR PF1=>AN+SR on AN PF0 (by CS offset & SR bundling)or SR F1 (by CH selection)

C. AN PF1+multiple SR PF0=>AN only on AN PF1 (by SR drop)

D. AN PF1+multiple SR PF1=>AN+SR on SR PF1 (by CH selection)

(3) Case #3

A. AN PF0+(multiple) SR PF0+(multiple) SR PF1

i. Option 1

1. If SR PF0 is a positive SR and has a highest priority, AN+SR on AN F0(by CS offset & SR bundling). In this case, SR bundling is limited to SRF0.

2. SR PF1 is a positive SR and has a highest priority, AN+SR on SR PF1(by CH selection).

ii. Option 2

1. Irrespective of whether an SR PF is a positive SR, AN+SR on AN PF0(by CS offset & SR bundling). In this case, both of SR PF0 and SR PF1are subjected to SR bundling.

iii. Option 3

1. Irrespective of whether an SR PF is a positive SR, AN+SR on SR PF1(by CH selection & SR bundling). In this case, both of SR PF0 and SR PF1are subjected to SR bundling.

B. AN PF1+(multiple) SR PF0+(multiple) SR PF1

i. Option 1

1. If SR PF0 is a positive SR and has a highest priority, AN only on ANPF1 (by SR drop).

2. If SR PF1 is a positive SR and has a highest priority, AN+SR on SRPF1 (by CH selection).

ii. Option 2

1. AN+SR on SR PF1 (by CH selection & SR bundling). In this case, bothof SR PF0 and SR PF1 are subjected to SR bundling.

[Proposed method #2] An A/N PUCCH resource and an SR PUCCH resource mayoverlap with each other in a slot (over all or part of the OFDM symbolsof a PUCCH) on the time axis. In this case, the UE may determine whetherto multiplex an A/N with a (positive) SR according to a relativerelationship between the starting transmission time of (MUX PUCCH) to beused for possible multiplexing between the A/N and the (positive) SR andthe starting transmission time of an SR PUCCH.

However, if the UE does not multiplex the A/N with the (positive) SR,the UE may drop transmission of one of the A/N and the (positive) SR.

For example, the UE may determine whether to multiplex the A/N with the(positive) SR depending on whether the starting transmission time of theSR PUCCH is earlier or later than the starting transmission time of theMUX PUCCH by T₀, as follows.

(1) If the starting transmission time of the SR PUCCH is earlier thanthe starting transmission time of the MUX PUCCH by T₀,

A. one of the A/N and the (positive) SR is selected and transmitted.

i. If the UCI state of the SR is positive SR, the SR is transmitted inthe SR PUCCH resource (A/N transmission drop).

ii. If the UCI state of the SR is negative SR, the AN is transmitted inthe A/N PUCCH resource.

(2) If the starting transmission time of the SR PUCCH is later than (orcoincides with) the starting transmission time of the MUX PUCCH by T₀,

A. the A/N and the (positive) SR are multiplexed and transmitted (or theUCI multiplexing rule applied to the case in which an A/N PUCCH and anSR PUCCH overlap with each other over all OFDM symbols of a PUCCH isfollowed).

i. The A/N PUCCH is in PUCCH format.

1. If the UCI state of the SR is positive SR, the A/N is transmitted ina resource resulting from applying a CS/OCC/PRB offset to the A/N PUCCH.

2. If the UCI state of the SR is negative SR, the AN is transmitted inthe A/N PUCCH resource.

ii. The A/N PUCCH is in PUCCH format 1.1.

If the UCI state of the SR is positive SR, the AN is transmitted in theSR PUCCH resource. However, if the SR PUCCH is in PUCCH format 0, onlythe AN is transmitted, without the SR.

2. If the UCI state of the SR is negative SR, the AN is transmitted inthe A/N PUCCH resource.

iii. The A/N PUCCH is in one of PUCCH formats 2, 3 and 4.

If the UCI state of the SR is positive SR or negative SR, A. UCI payloadis generated by representing the SR in explicit bit(s) and appending theSR to the A/N, and then the generated UCI is transmitted in the A/NPUCCH resource.

T₀ may be one of the following values, and represented in (OFDM)symbols.

(1) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for demodulation according to a UEcapability or a value corresponding to the UE processing time.

(4) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(5) A value preset between an eNB and a UE (e.g., a fixed value).

[Proposed method #2] may be applied when an A/N PUCCH is in PUCCH format0/2/3/4.

In the NR system, if an A/N PUCCH and an SR PUCCH differ in theirstarting (OFDM) symbols, a method of determining whether to multiplex anA/N with an SR by comparing the starting (OFDM) symbol (or startingtime) of an A/N PUCCH for possible A/N only transmission (hereinafter,referred to as A/N PUCCH 1) and the starting (OFDM) symbol (or startingtime) of the SR PUCCH has been considered. For example, if the starting(OFDM) symbol of the SR PUCCH is earlier than the starting (OFDM) symbolof A/N PUCCH 1, the UE transmits the SR PUCCH, dropping A/Ntransmission. On the contrary, if the starting (OFDM) symbol of the SRPUCCH is later than (or coincides with) the starting (OFDM) symbol ofA/N PUCCH 1, the UE may UCI-multiplex the SR with the A/N and transmitthe multiplexed UCI on a single PUCCH. The above operation is based onthe expectation that the UE will first process a PUCCH having an earlierstarting (OFDM) symbol. In the NR system, however, when the UEmultiplexes an A/N with an SR and transmits the multiplexed A/N and SRin a single PUCCH resource, if the A/N PUCCH is in PUCCH format 0/2/3/4,the single PUCCH resource may be a new A/N PUCCH resource (hereinafter,referred to as A/N PUCCH 2) selected based on a calculated total UCIpayload size of the A/N and the SR. Therefore, when the UE determinesthat the starting (OFDM) symbol of the SR PUCCH is later than (orcoincides with) the starting (OFDM) symbol of A/N PUCCH 1 and then is totransmit the A/N and the SR on A/N PUCCH 2, it may occur that thestarting (OFDM) symbol of A/N PUCCH 2 is earlier than that of the SRPUCCH. Therefore, for a more consistent UE operation, it may bepreferred to compare the starting (OFDM) symbol of the SR PUCCH with thestarting (OFDM) symbol of A/N PUCCH 2, instead of A/N PUCCH 1.

[Proposed method #3] An A/N PUCCH resource and an SR PUCCH resource mayoverlap with each other in a slot (over all or part of OFDM symbols of aPUCCH) on the time axis. Herein, the starting transmission time of aPUCCH (MUX PUCCH) to be used for possible multiplexing between an A/Nand a (positive) SR may be later than the starting transmission time ofthe SR PUCCH. In this case, if there is an on-going SR PUCCHtransmission (in a best effort manner), the UE may multiplex the A/Nwith the (positive) SR and transmit the multiplexed A/N and SR on theMUX PUCCH, while discontinuing the SR PUCCH transmission.

Additionally, if an A/N PUCCH resource and an SR PUCCH resource overlapwith each other (over all or part of the OFDM symbols of a PUCCH) on thetime axis, the starting transmission time of a PUCCH (MUX PUCCH) to beused for possible multiplexing between an A/N and a (positive) SR may belater than the starting transmission time of the A/N PUCCH. In thiscase, if there is an on-going A/N PUCCH transmission (in the best effortmanner), the UE may multiplex the A/N with the (positive) SR andtransmit the multiplexed A/N and SR on the MUX PUCCH, whilediscontinuing the A/N PUCCH transmission.

It is to be noted that the above operation may be applied restrictivelyto a UE having a specific UE capability.

If the UE identifies the presence of an A/N PUCCH resource overlappedpartially with an SR PUCCH on the time domain after SR transmission, theUE may simply drop A/N transmission. However, if the UE has a sufficientcapability, the UE may attempt to multiplex an A/N with an SR andtransmit the multiplexed A/N and SR in a single PUCCH resource, whilediscontinuing an on-going SR transmission, as far as the UE issufficiently capable (i.e., in the best effort manner). On the contrary,after the UE performs A/N transmission, a positive SR for an SR PUCCHresource overlapped partially with an A/N PUCCH on the time axis may begenerated. In this case, the UE may also attempt to multiplex an A/Nwith the SR and transmit the multiplexed A/N and SR in a single PUCCHresource, while discontinuing an on-going A/N transmission (i.e., in thebest effort manner). In [proposed method #3], the UE may supportmultiplexed transmission of an A/N and an SR even when the SR collideswith the A/N.

[Proposed method #4] It may occur that an A/N PUCCH is in PF0 or PF1 andan A/N PUCCH resource and SR PUCCH resource(s) overlap with each otheron the time axis in a slot (over all or part of the OFDM symbols of aPUCCH). In this case, the UE may apply a different UCI multiplexing ruleto an A/N and an SR according to the number of SR processescorresponding to the SR PUCCH resource(s) overlapped with the A/N PUCCHresource.

For example, the UE may apply a UCI multiplexing rule to the A/N and theSR depending on whether there are one or more SR processes correspondingto the SR PUCCH resource(s) overlapped with the A/N PUCCH resource, asfollows.

(1) There is on SR process (overlapped with the A/N).

A. The A/N PUCCH is in PUCCH format 0.

i. If the UCI state of the SR is positive SR, the A/N is transmitted ina resource resulting from applying a CS/OCC/PRB offset to the A/N PUCCH.

ii. If the UCI state of the SR is negative SR, the A/N is transmitted inthe A/N PUCCH resource.

B. The A/N PUCCH is in PUCCH format 1.

i. If the UCI state of the SR is positive SR, the A/N is transmitted inthe SR PUCCH resource.

ii. If the UCI state of the SR is negative SR, the A/N is transmitted inthe A/N PUCCH resource.

(2) There are two or more SR processes (overlapped with the A/N).

A. The A/N PUCCH is in PF 0 or PF1.

i. Multiple bits representing an SR (for the plurality of SR processes)are added to the A/N, and the whole UCI is transmitted in the A/N PUCCHresource. The A/N PUCCH resource may be a resource selected based on thesize of UCI payload including the A/N and the multi-bit SR, and may bein one of PF 2, PF 3 and PF 4.

SR PUCCH resource configurations corresponding to the plurality of SRprocesses may be identified by specific IDs and may be independent ofeach other.

If an A/N PUCCH is in PF0 or PF1, 2 or fewer bits is supported as an A/Npayload size in the NR system. If information about one SR process isadded, the UE may represent a positive/negative SR for the SR process byusing a resource selection scheme instead of a PUCCH format (e.g.,PF2/3/4) for a large UCI payload size with a smaller multiplexingcapacity. However, if an A/N PUCCH resource overlaps with SR PUCCHresource(s) corresponding to a plurality of SR processes, the UE isrequired to transmit information indicating which SR process is apositive/negative SR in addition to a positive/negative SR. In thiscase, since a large number of bits is required to represent the SRinformation, it may be more efficient to use the PUCCH format (e/g.PF2/3/4) for a large UCI payload size of 3 or more bits than to use aresource selection scheme as used for one SR process.

[Proposed method #5] If an A/N PUCCH resource and a CSI SR PUCCHresource may overlap with each other in a slot (over all or part of OFDMsymbols of a PUCCH) on the time axis, multiplexing between an A/N andCSI is supported as follows.

(1) The A/N PUCCH is not based on a DL assignment.

A. If an A/N PUCCH resource corresponding to (indicated by) PDSCH(s)(and/or PDCCH(s)) which has been received (or of which the transmissionhas started) until a time earlier than the starting transmission time ofa CSI PUCCH by T₀ overlaps with the CSI PUCCH resource on the time axis,

i. the A/N and the CSI are multiplexed and transmitted on the CSI PUCCH.

B. Else

i. Opt. 1: The CSI is transmitted in the CSI PUCCH resource (A/Ntransmission drop).

ii. Opt. 2: The A/N is transmitted in the A/N PUCCH resource (CSItransmission dropped).

(2) The A/N PUCCH resource is based on a DL assignment.

A. The A/N and the CSI are multiplexed and transmitted in an A/Nresource (reselected based on total UCI). However, if a time is tooshort to update the CSI (e.g., a CSI reference resource is earlier thanthe starting transmission time of the A/N PUCCH resource by T₁), the UEmay not update the CSI.

The CSI reference resource means a time resource referred to for CSIcalculation. A (valid) DL slot may mean a slot configured as a DL slot(for a UE) and/or a slot which is not included in a measurement gapand/or a slot included in a DL BWP for which CSI is reported.

T₀ may be one of the following values, and represented in (OFDM)symbols.

(1) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for demodulation according to a UEcapability or a value corresponding to the UE processing time.

(4) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(5) A value preset between an eNB and a UE (e.g., a fixed value).

T₁ may be one of the following values, and represented in (OFDM)symbols.

(1) A UE processing time required to calculate and report CSI, and avalue corresponding to the UE processing time.

(2) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(3) A value preset between an eNB and a UE (e.g., a fixed value).

In the NR system, when an A/N for a PDSCH based on a DL assignment (=DLscheduling DCI) is multiplexed with CSI, the multiplexed A/N and CSI maybe transmitted in an A/N PUCCH resource reselected based on the totalsize of UCI payload of the A/N and the CSI. When an A/N PUCCH overlapspartially with a CSI PUCCH on the time axis, the multiplexing operationmay also be applied. However, if a CSI reference resource is earlierthan the starting transmission time of the A/N PUCCH by a UE processingtime T₀, it may be difficult for the UE to update the CSI. Therefore, itis proposed that when it is difficult to update CSI, the CSI is notupdated (notably, the non-updated CSI is still multiplexed with an A/Nand reported), and otherwise, the CSI is updated, multiplexed with theA/N, and reported.

On the other hand, if the A/N does not correspond to a DLassignment-based PDSCH, the UE may multiplex the A/N with the CSI andtransmit the multiplexed A/N and CSI on the CSI PUCCH. When the A/N istransmitted on the CSI PUCCH, multiplexing between the A/N and the CSImay be allowed, only when a minimum UL timing for A/N transmission isensured. That is, only when an A/N PUCCH (and/or PDCCH(s)) received (orstarting to be transmitted) until a time earlier than the startingtransmission time of a CSI PUCCH by T₁ overlaps with the CSI PUCCH, theUE may multiplex the A/N with the CSI, and otherwise, the UE maytransmit only the CSI PUCCH, while dropping the A/N transmission.

[Proposed method #6] The UE may puncture some (OFDM) symbol(s) in aspecific PUCCH (or PUSCH) resource (hereinafter, referred to as UL-CH1),and transmit another PUCCH (or PUSCH) resource (hereinafter, referred toas UL-CH2) in the (OFDM) symbol(s). In this case, transmission power maybe applied to UL-CH2 in the following manner.

(1) Opt. 1

A. Transmission power is configured for UL-CH2 independently (of that ofUL-CH1).

i. If the transmission power of UL-CH2 falls within a predeterminedrange with respect to the transmission power of UL-CH1, the UE maytransmit resources resulting from the puncturing of UL-CH1(non-continuously).

ii. If the transmission power of UL-CH2 is outside the predeterminedrange with respect to the transmission power of UL-CH1,

1. when there is a DM-RS within the resources resulting from the UL-CH1puncturing, the remaining resources of UL-CH1 are transmitted. Herein,the DM-RS is a reference signal for data demodulation.

2. When there is a DM-RS within the resources resulting from the UL-CH1puncturing, the remaining resources of UL-CH1 are not transmitted.

(2) Opt. 2

A. The same transmission power as that of UL-CH1 is applied to UL-CH2.

(3) Opt. 3

A. Let transmission power configured for UL-CH2 independently (ofUL-CH1) be denoted by TXP1 and maximum transmission power ensuring phasecontinuity for UL-CH1 be denoted by TXP2. Then, min(TXP1, TXP2) isapplied as the transmission power of UL-CH2. Phase continuity means thatthere is no phase difference between resources before the UL-CH1puncturing and resources after the UL-CH1 puncturing, except for achannel change-caused phase difference.

i. TXP2 may be any value that the UE selects according toimplementation.

i. An existing UL power control (PC) rule set for UL-CH2 may be liftedexceptionally.

For example, it may occur that the UE should perform PUCCH transmissionfor an emergency service (e.g., URLLC) in the middle of PUSCHtransmission. In this case, since the PUSCH transmission is on-going,the UE should discontinue the PUSCH transmission and transmit a PUCCH.From the perspective of PUSCH transmission, only OFDM symbols carryingthe PUCCH may be punctured. In this case, the transmission power of thePUCCH in the puncturing period may be different from that of the PUSCH.Therefore, as a power amplifier (PA) configuration is initialized, aPUSCH resource transmitted before the puncturing period and a PUSCHresource transmitted after the puncturing period may have differentphases (in transmission signals). The problem is attributed to a greatchange in the transmission power of the UE, caused by the PUCCHtransmission in the middle of the PUSCH transmission. Therefore, whenthe UE punctures some (OFDM) symbol(s) in a PUCCH (or PUSCH) resource(i.e., UL-CH1) and transmits another PUCCH (or PUSCH) resource (i.e.,UL-CH2) in the (OFDM) symbol(s), the UE may perform the followingoperation to reduce a phase change.

(1) The UE may set the transmission power of UL-CH2 equal to that ofUL-CH1.

(2) Or, the UE performs independent UL power control for UL-CH2, whereinif there is a power difference between UL-CH2 and UL-CH1, causing aphase difference, the remaining UL-CH1 resources after the transmissionof UL-CH2 are transmitted, only when the remaining UL-CH1 resourcesinclude a DM-RS.

PUCCH/PUSCH Multiplexing

[Proposed method #6.1] An A/N PUCCH resource and a PUSCH resource mayoverlap with each other in a slot (over all or part of the OFDM symbolsof a PUCCH or PUSCH) on the time axis. In this case, the UE determineswhether to multiplex an A/N with UL data (or whether to piggyback theA/N to the PUSCH) depending on whether an A/N PUCCH resourcecorresponding to (indicated by) PDSCH(s) (and/or PDCCH(s)) which hasbeen received (or of which the transmission has started) until aspecific time (earlier than a reference time) overlaps with the PUSCHresource.

However, if the UE does not multiplex the A/N with the UL data, the UEmay drop transmission of one of the A/N and the UL data.

For example, the UE may determine whether to piggyback an A/N to a PUSCHdepending on whether an A/N PUCCH resource corresponding to (orindicated by) PDSCH(s) (and/or PDCCH(s)) which has been received (or ofwhich the transmission has started) until a time earlier than thestarting transmission time (e.g., starting symbol) of the PUSCH by T₀overlaps with the PUSCH on the time axis.

(1) If the A/N PUCCH resource corresponding to (indicated by) thePDSCH(s) (and/or PDCCH(s)) which has been received (or of which thetransmission has started) until the time earlier than the startingtransmission time of the PUSCH by T₀ overlaps with the PUSCH resource onthe time axis,

-   -   the UE multiplexes the A/N with the UL data and transmits the        multiplexed A/N and UL data (i.e., the UE piggybacks the A/N to        the PUSCH and transmits the PUSCH piggybacked with the A/N) (or        the UE follows the UCI multiplexing rule applied to the case in        which an A/N PUCCH and a PUSCH overlap with each other over all        of the OFDM symbols of the PUCCH or the PUSCH).

In any other case other than (1) (e.g., if an A/N PUCCH resourcecorresponding to PDSCH(s) (and/or PDCCH(s)) which has been received (orof which the transmission has started/ended) after the time earlier thanthe starting transmission time (e.g., starting symbol) of the PUSCH byT₀ overlaps with the PUSCH on the time axis, if the A/N PUCCH resourcecorresponding to (indicated by) the PDSCH(s) (and/or PDCCH(s)) which hasbeen received (or of which the transmission has started) until the timeearlier than the starting transmission time (e.g., starting symbol) ofthe PUSCH by T₀ does not overlap with the PUSCH on the time axis, or ifthere is no A/N PUCCH resource corresponding to (indicated by) thePDSCH(s) (and/or PDCCH(s)) which has been received (or of which thetransmission has started) until the time earlier than the startingtransmission time (e.g., starting symbol) of the PUSCH by T₀,

-   -   Opt. 1: the UL data is transmitted in the PUSCH resource (A/N        transmission drop).    -   Opt. 2: the A/N is transmitted in the A/N PUCCH resource (PUSCH        transmission drop).

For a UE of a specific version, however, an A/N for a PDSCH scheduled bya DL assignment, received after a UL grant for a PUSCH is received maynot be subjected to UCI piggyback.

T₀ may be one of the following values, and represented in (OFDM)symbols.

(1) A UE processing time required to transmit an A/N after a PDSCH ends,according to a UE capability, and a value corresponding to the UEprocessing time. Or a UE processing time required for UCI (PUCCH)transmission according to a UE capability, and a value corresponding tothe UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time. Or a UEprocessing time required for UCI (PUCCH) transmission according to a UEcapability, and a value corresponding to the UE processing time.

(3) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for (specific) UCI transmissionaccording to a UE capability, or a value corresponding to the UEprocessing time.

(4) A UE processing time required for PUSCH transmission after a ULgrant is received, according to a UE capability, or a valuecorresponding to the UE processing time.

(5) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(6) A value preset between an eNB and a UE (e.g., a fixed value).

[Proposed method #6.1] may also be extended to a PUCCH other than theA/N PUCCH.

In the NR system, if the starting (OFDM) symbol (or starting time) of aPUCCH coincides with the starting (OFDM) symbol (or starting time) of aPUSCH, a UE operation of applying the same UCI multiplexing rule asapplied to a case in which a PUCCH and a PUSCH fully overlap with eachother on the time axis has been agreed on. Since the PUCCH and the PUSCHare multiplexed and transmitted in a PUSCH resource, if a processingtime required to transmit specific UCI in the PUCCH is not secured untilbefore the beginning of the transmission of the PUSCH resource, thePUCCH may not be multiplexed in the PUSCH. For example, if the PUCCH isa PUCCH for HARQ-ACK transmission (A/N PUCCH), the UE may transmit onlyan A/N for PDSCH(s) (and/or PDCCH(s)) received until a time earlier thanthe starting transmission time of the PUSCH by T₀ (a time required totransmit the A/N after receiving the PDSCH according to a UEcapability). Therefore, similarly to the UCI multiplexing rule betweenan SR PUCCH and an A/N PUCCH ([proposed method #1]), the UE maydetermine whether to perform UCI piggyback for an A/N depending onwhether an A/N PUCCH resource for the PDSCH(s) (and/or PDCCH(s))received until the time earlier than the starting transmission time ofthe PUSCH by T₀ overlaps with a PUSCH resource. That is, if the A/NPUCCH resource for the PDSCH(s) (and/or PDCCH(s)) received until thetime earlier than the starting transmission time of the PUSCH by T₀overlaps with the PUSCH resource, the UE transmits the A/NUCI-piggybacked to the PUSCH, and otherwise, the UE may transmit onlythe PUSCH, dropping the A/N transmission. FIG. 14 illustrates anexemplary operation according to [proposed method #6.1].

In a modification to [proposed method #6.1], if a CSI PUCCH overlapswith a PUSCH on the time axis, the UE may UCI-piggyback CSI to the PUSCHwithout transmitting the CSI PUCCH. Herein, if a processing time for CSIcalculation is not sufficient until the UE prepares for the PUSCHtransmission, the UE may not update the CSI.

If an A/N PUCCH resource (fully or partially) overlaps with another ULchannel on the time axis, the UE may operate as follows according to[proposed method #1] and [proposed method #6.1] in combination.

(1) If a UL channel overlapped with the A/N PUCCH on the time axis isnot configured/indicated until a time earlier than the startingtransmission time (or slot) of the A/N PUCCH by T₀ (e.g., the UL channelmay be a PUCCH carrying an SR or a PUSCH carrying a UL-SCH TB),

A. the UE transmits only the A/N in the A/N PUCCH resource (even thougha UL channel overlaps with the A/N PUCCH after the time, the UE ignoresthe UL channel or drops/gives up the UL channel transmission).

(2) In the case where a UL channel overlapped with the A/N PUCCH on thetime axis is configured/indicated until the time earlier than thestarting transmission time (or slot) of the A/N PUCCH by T₀ (e.g., theUL channel may be a PUCCH carrying an SR or a PUSCH carrying a UL-SCHTB),

A. when the UL channel is a PUCCH (hereinafter, referred to as PUCCH-A)carrying (specific) UCI (hereinafter, referred to as UCI-A),

i. if an A/N PUCCH resource corresponding to (or indicated by) PDSCH(s)(and/or PUDCCH(s)) which has been received (or of which the transmissionhas started) until a time earlier than the starting transmission time ofPUCCH-A by T₁ overlaps with a PUCCH-A resource on the time axis, the UEmultiplexes the A/N with UCI-A and transmits the multiplexed A/N andUCI-A in a single PUCCH resource.

ii. In any other case (e.g., if the A/N PUCCH resource corresponding to(indicated by) the PDSCH(s) (and/or PUDCCH(s)) which has been received(or of which the transmission has started) until the time earlier thanthe starting transmission time of PUCCH-A by T₁ does not overlap withthe PUCCH-A resource on the time axis, or if there is no A/N PUCCHresource corresponding to (indicated by) the PDSCH(s) (and/or PUDCCH(s))which has been received (or of which the transmission has started) untilthe time earlier than the starting transmission time of PUCCH-A by T₁,the UE selects and transmits one of the A/N and UCI-A.

-   -   Opt. 1: UCI-A (only) is transmitted in the PUCCH-A resource (A/N        transmission drop).    -   Opt. 2: The A/N (only) is transmitted in the A/N resource (UCI-A        transmission drop).    -   Opt. 3: Opt. 1 or Opt. 2 is applied according to the state of        UCI-A.

B. In the case where the UL channel is a PUSCH carrying a UL-SCH TB (orUL data),

i. if an A/N PUCCH resource corresponding to (indicated by) PDSCH(s)(and/or PUDCCH(s)) which has been received (or of which the transmissionhas started) until a time earlier than the starting transmission time ofthe PUSCH by T₂ overlaps with a PUSCH resource on the time axis,

1. the A/N is multiplexed with the UL data and transmitted (i.e., theA/N is UCI-piggybacked to the PUSCH) (or the UCI multiplexing ruleapplied to the case in which an A/N PUCCH and a PUSCH fully overlap witheach other over all of the OFDM symbols of the PUCCH or the PUSCH isfollowed).

ii. In any other case (e.g., if the A/N PUCCH resource corresponding to(indicated by) the PDSCH(s) (and/or PUDCCH(s)) which has been received(or of which the transmission has started) until the time earlier thanthe starting transmission time of the PUSCH by T₂ does not overlap withthe PUSCH resource on the time axis, or of there is no A/N PUCCHresource corresponding to (indicated by) the PDSCH(s) (and/or PUDCCH(s))which has been received (or of which the transmission has started) untilthe time earlier than the starting transmission time of the PUSCH byT₂), one of the A/N and the UL-SCH is selected and transmitted.

-   -   Opt. 1: the UL-SCH (only) is transmitted in the PUSCH resource        (A/N transmission drop).    -   Opt. 2: the A/N (only) is transmitted in the A/N PUCCH resource        (UL-SCH transmission drop).

Each of T₀, T₁, and T₂ may be one of the following values, andrepresented in (OFDM) symbols.

(1) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for (specific) UCI transmissionaccording to a UE capability or a value corresponding to the UEprocessing time.

(4) A UE processing time required for PUSCH transmission after a ULgrant is received, according to a UE capability or a value correspondingto the UE processing time.

(5) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(6) A value preset between an eNB and a UE (e.g., a fixed value).

In a modification of the present disclosure, if PUCCH-PUCH overlap orPUCCH-PUSCH overlap occurs on the time axis, the UE may apply thefollowing (generalized) UCI multiplexing rule.

(1) If a UL channel overlapped with a PUCCH resource for specific UCI onthe time axis is not configured/indicated until a time earlier than thestarting transmission time (or slot) of the PUCCH resource by T₀ (e.g.,the UL channel may be a PUCCH or a PUSCH),

A. the UE transmits only the UCI in the PUCCH resource (even though a ULchannel overlaps with the PUCCH after the time, the UE ignores the ULchannel or drops/gives up the UL channel transmission).

(2) If a PUCCH resource (PUCCH₁) for specific UCI₁ is firstconfigured/indicated and then a PUCCH resource (PUCCH₂) for specificUCI₂ overlapped with PUCCH₁ on the time axis is configured/indicateduntil a time earlier than the starting transmission time (or slot) ofthe PUCCH resource (PUCCH₁) for UCI₁ by T₀,

A. the UE multiplexes UCI₁ with UCI₂ and transmits the multiplexed UCI₁and UCI₂ in a single PUCCH resource.

i. The single PUCCH resource may be a resource other than PUCCH₁ andPUCCH₂.

(3) If a PUCCH resource for specific UCI is first configured/indicatedand then a PUSCH resource for a UL-SCH TB overlapped with the PUCCHresource on the time axis is configured/indicated until a time earlierthan the starting transmission time (or slot) of the PUCCH resource forthe specific UCI by T₀,

A. the UE multiplexes the UCI with the UL-SCH and transmits themultiplexed UCI and UL-SCH in the PUSCH resource (i.e., UCI piggyback).

(4) If a UL channel overlapped with a PUSCH resource for a specificUL-SCH on the time axis is not configured/indicated until a time earlierthan the starting transmission time (or slot) of the PUSCH resource forthe specific UL-SCH by T₁ (e.g., the UL channel may be a PUCCH),

A. the UE transmits only the specific UL-SCH in the PUSCH resource (eventhough a UL channel overlaps with the PUSCH after the time, the UEignores the UL channel or drops/gives up the UL channel transmission).

(5) If a PUSCH resource for a specific UL-SCH is firstconfigured/indicated and then a PUCCH resource for specific UCIoverlapped with the PUSCH resource on the time axis isconfigured/indicated until a time earlier than the starting transmissiontime (or slot) of the PUSCH resource by T₁,

A. the UE multiplexes the UCI with the UL-SCH TB and transmits themultiplexed UCI and UL-SCH TB in the PUSCH resource (i.e., UCIpiggyback).

Each of T₀ and T₁ may be one of the following values, and represented in(OFDM) symbols.

(1) A UE processing time required to transmit an A/N (PUCCH)corresponding to a PDSCH after the PDSCH is received, according to a UEcapability, and a value corresponding to the UE processing time.

(2) A UE processing time required to transmit an A/N (PUCCH) indicatedby a PDCCH after the PDCCH is received, according to a UE capability,and a value corresponding to the UE processing time.

(3) A UE processing time required for (specific) UCI transmissionaccording to a UE capability or a value corresponding to the UEprocessing time.

(4) A UE processing time required for PUSCH transmission after a ULgrant is received, according to a UE capability or a value correspondingto the UE processing time.

(5) A value configured by higher-layer signaling (e.g., RRC signaling)and/or DCI.

(6) A value preset between an eNB and a UE (e.g., a fixed value).

If specific UCI is an A/N, a time when a PUCCH resource for the UCI isconfigured/indicated may be considered to be a time when a PDSCHcorresponding to the A/N is received (ends).

The operation of first configuring/indicating a PUCCH resource forspecific UCI may include configuring the PUCCH resource based on ahigher-layer signal (e.g., RRC signal). For example, a PUCCH resourcepreconfigured by higher-layer signaling may always be considered asconfigured/indicated earlier than a PUCCH resource indicated by DCI. Forexample, UCI₁ and UCI₂ may be an SR and an A/N, respectively or(periodic) CSI and an HARQ-ACK, respectively.

It is to be noted that the following multiplexing operation may beperformed for UCI₁ and UCI₂.

(1) UCI₁=SR and UCI₂=A/N

A. The A/N PUCCH is in PUCCH format 0.

i. If the UCI state of the SR is positive SR,

1. The A/N is transmitted in a resource resulting from applying aCS/OCC/PRB offset to the A/N PUCCH.

ii. If the UCI state of the SR is negative SR,

1. the A/N is transmitted in the A/N PUCCH resource.

B. The A/N PUCCH is in PUCCH format 1,

i. If the UCI state of the SR is positive SR,

1. the A/N is transmitted in the SR PUCCH resource.

A. However, if the SR PUCCH is in PUCCH format 0, only the A/N istransmitted while the SR transmission is dropped.

ii. If the UCI state of the SR is negative SR,

1. the A/N is transmitted in the A/N PUCCH resource.

C. The A/N PUCCH is in one of PUCCH formats 2, 3 and 4.

i. If the UCI state of the SR is positive SR or negative SR,

1. UCI payload is generated by representing the SR in explicit bit(s)and appending the SR to the A/N, and the UCI is transmitted in the A/NPUCCH resource.

(2) UCI₁=CSI and UCI₂=A/N

A. If the A/N PUCCH is indicated by a DL assignment,

i. the A/N and the CSI are multiplexed and transmitted in the A/N PUCCHresource.

B. If the A/N PUCCH is not indicated by a DL assignment,

i. the A/N and the CSI are multiplexed and transmitted in the CSI PUCCHresource.

[Proposed method #7] An A/N PUCCH resource and a PUSCH resource mayoverlap with each other in a slot (over all or part of the OFDM symbolsof a PUCCH or a PUSCH) on the time axis. The starting transmission timeof the A/N PUCCH may be later than the transmission time of the PUSCH.In this case, if there is an on-going PUSCH transmission (in the besteffort manner), the UE may transmit the A/N on the A/N PUCCH,discontinuing the PUSCH transmission.

Additionally, an A/N PUCCH resource and a PUSCH resource may overlapwith each other in a slot (over all or part of the OFDM symbols of aPUCCH or a PUSCH) on the time axis. The starting transmission time ofthe A/N PUCCH may be earlier than the transmission time of the PUSCH. Inthis case, if there is an on-going PUCCH transmission (in the besteffort manner), the UE may piggyback the A/N to the PUSCH, discontinuingthe PUCCH transmission.

If the UE identifies the presence of an A/N PUCCH resource partiallyoverlapped with the PUCCH on the time axis after transmitting the PUSCH,the UE may simply drop the A/N transmission. However, if the UE issufficiently capable, the UE may attempt to transmit the A/N in the A/NPUCCH resource, discontinuing the on-going PUSCH transmission (i.e., inthe best effort manner), if possible. By the operation of [proposedmethod #6.1], the UE may support the A/N transmission as much aspossible even though the PUSCH collides with the A/N.

Based on the above description, (UCI) multiplexing between PUCCHs orbetween a PUCCH and a PUSCH in one slot is summarized as follows.

(1) Step #1: PUCCHs (referred to as resource set X) overlapped in timewith a PUCCH (referred to as resource A) having the earliest startingsymbol (and the earliest/last ending symbol) in a slot may be selected.

(2) Step #2: It may be determined to multiplex UCIs configured/indicatedfor transmission on all of PUCCHs belonging to resource A and resourceset X and transmit the multiplexed UCI on a specific one PUCCH (referredto as resource N). For example, after [resource A and resource set X]are replaced with resource N, PUCCH resources to be multiplexed in theslot may be newly updated.

(3) Step #3: If there is any PUCCH overlapped in time with resource N,the procedure may start again with Step #1 (for the updated PUCCHs). Inthe absence of a PUCCH overlapped with resource N, it may be checkedwhether resource N overlaps with a PUSCH.

(4) Step #4: In the presence of a PUSCH overlapped with resource N intime, the multiplexed UCI determined to be transmitted in resource N maybe transmitted piggybacked to the PUSCH. On the contrary, in the absenceof a PUSCH overlapped with resource N, the multiplexed UCI may betransmitted in resource N, as determined before.

For the purpose of CSI feedback/report transmission, a specific resourcemay be configured semi-statically (by RRC signaling). Specifically, asingle-CSI PUCCH resource for transmission of a single CSI report onlyand/or a multi-CSI PUCCH resource for simultaneous transmission of aplurality of CSI reports may be configured for the UE.

With a plurality of (e.g., 2) (single-)PUCCH resources (e.g., CSI PUCCHresource 1/2) configured without overlap in time in a slot, an A/N PUCCHresource indicated by DL grant DCI may overlap in time with both of CSIPUCCH resource 1 and CSI PUCCH resource 2. In this case, the followingoperations may be considered depending on whether a multi-CSI PUCCHresource has been configured for the UE.

1) Case in which when Step #1 and Step #2 are applied, resource set Xincluding resource A includes all of an A/N PUCCH resource, CSI PUCCHresource 1, and CSI PUCCH resource 2.

A. If a multi-PUCCH resource has been configured for the UE (in acorresponding slot), the UE may multiplex all of a plurality of CSIreports configured for CSI PUCCH resource 1 and CSI PUCCH resource 2 andtransmit the multiplexed CSI report on the A/N PUCCH.

B. If a multi-PUCCH resource has not been configured for the UE (in theslot), the UE may transmit only one highest-priority CSI report amongthe plurality of CSI reports configured for CSI PUCCH resource 1 and CSIPUCCH resource 2 on the A/N PUCCH. In this case, the UE may droptransmission of the remaining CSI reports or transmit (all or a part of)the CSI reports on a PUCCH (e.g., a CSI PUCCH configured/indicated foreach of the CSI reports) other than the A/N PUCCH.

2) Case in which when Step #1 and Step #2 are applied, resource set Xincluding resource A includes an A/N PUCCH resource and only CSI PUCCHresource 1 (having an earlier starting symbol).

A. The UE may transmit only a CSI report configured for CSI PUCCHresource 1 on the A/N PUCCH irrespective of whether a multi-CSI PUCCHresource has been configured for the UE (in the slot). In this case, theUE may drop transmission of the remaining CSI reports or transmit (allor a part of) the CSI reports on a PUCCH (e.g., a CSI PUCCHconfigured/indicated for each of the CSI reports) other than the A/NPUCCH.

With a plurality of (e.g., 2) (single-)PUCCH resources (e.g., CSI PUCCHresource 1/2) configured without overlap in time in a slot, an SR PUCCHresource and/or an SPS A/N PUCCH resource configured/indicated fortransmission of an SPS PDSCH may overlap in time with both of CSI PUCCHresource 1 and CSI PUCCH resource 2. In this case, the followingoperations may be considered depending on whether a multi-CSI PUCCHresource has been configured for the UE.

1) Case in which when Step #1 and Step #2 are applied, resource set Xincluding resource A includes all of an SR PUCCH and/or an SPS A/N PUCCHresource, and CSI PUCCH resources 1 and 2.

A. If a multi-PUCCH resource has been configured for the UE (in acorresponding slot),

i. the UE may multiplex and transmit all of SR information and/or A/Ninformation for an SPS PDSCH and a plurality of CSI reports configuredfor CSI PUCCH resource 1 and CSI PUCCH resource 2 in the multi-CSI PUCCHresource.

B. If a multi-PUCCH resource has not been configured for the UE (in theslot),

i. the UE may select a CSI PUCCH carrying a best CSI report of a highestpriority from among a plurality of CSI PUCCHs, and multiplex andtransmit all of (the best CSI report,) SR information and/or A/Ninformation for an SPS PDSCH on the PUCCH. Therefore, the UE may droptransmission of the remaining CSI reports and CSI PUCCHs configured forthe CSI reports or transmit (all or a part of) the CSI reports on a CSIPUCCH configured/indicated for each of the CSI reports.

2) Case in which when Step #1 and Step #2 are applied, resource set Xincluding resource A includes an A/N PUCCH resource and only CSI PUCCHresource 1 (having an earlier starting symbol).

A. The UE may perform the following operations irrespective of whether amulti-CSI PUCCH resource has been configured for the UE (in acorresponding slot).

i. The UE may multiplex only a CSI report configured in CSI PUCCHresource 1 with SR information and/or A/N information for an SPS PDSCHand transmit the multiplexed information in CSI PUCCH resource 1.Therefore, the UE may drop transmission of the remaining CSI reports andCSI PUCCHs configured for the CSI reports, or transmit (all or a partof) the CSI reports on CSI PUCCHs configured/indicated for the CSIreports.

Further, a single PUCCH resource configured for transmission of aplurality of multiplexed CSI reports and/or one or more PUCCH resourcesconfigured for transmission of a single CSI report may overlap with aPUSCH in time in a slot. In this case, the UE may perform the followingoperations depending on whether a multi-CSI PUCCH resource has beenconfigured for the UE.

1) Case in which a multi-CSI PUCCH resource has been configured (in acorresponding slot) for the UE.

A. The UE piggybacks all of a plurality of (multiplexed) CSI reportsconfigured in one or more CSI PUCCHs overlapped with the PUSCH to thePUSCH and transmits the piggybacked CSI reports.

2) Case in which a multi-CSI PUCCH resource has not been configured (inthe slot) for the UE.

A. The UE may piggyback only one highest-priority CSI report among theplurality of CSI reports configured in the one or more CSI PUCCHsoverlapped with the PUSCH to the PUSCH and transmit the piggybacked CSIreport. Therefore, the UE may drop transmission of the remaining CSIreports.

FIG. 14 illustrates a BS and a UE of a wireless communication system,which are applicable to embodiments of the present disclosure.

Referring to FIG. 14, the wireless communication system includes a BS110 and a UE 120. When the wireless communication system includes arelay, the BS or UE may be replaced by the relay.

The BS 110 includes a processor 112, a memory 114 and a radio frequency(RF) unit 116. The processor 112 may be configured to implement theprocedures and/or methods proposed by the present disclosure. The memory114 is connected to the processor 112 and stores information related tooperations of the processor 112. The RF unit 116 is connected to theprocessor 112 and transmits and/or receives an RF signal. The UE 120includes a processor 122, a memory 124 and an RF unit 126. The processor122 may be configured to implement the procedures and/or methodsproposed by the present disclosure. The memory 124 is connected to theprocessor 122 and stores information related to operations of theprocessor 122. The RF unit 126 is connected to the processor 122 andtransmits and/or receives an RF signal.

The embodiments of the present disclosure described hereinbelow arecombinations of elements and features of the present disclosure. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent disclosure may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent disclosure may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It will beobvious to those skilled in the art that claims that are not explicitlycited in each other in the appended claims may be presented incombination as an embodiment of the present disclosure or included as anew claim by a subsequent amendment after the application is filed.

In the embodiments of the present disclosure, a description is madecentering on a data transmission and reception relationship among a BS,a relay, and an MS. In some cases, a specific operation described asperformed by the BS may be performed by an upper node of the BS. Namely,it is apparent that, in a network comprised of a plurality of networknodes including a BS, various operations performed for communicationwith an MS may be performed by the BS, or network nodes other than theBS. The term ‘BS’ may be replaced with the term ‘fixed station’, ‘NodeB’, ‘enhanced Node B (eNode B or eNB)’, ‘access point’, etc. The term‘UE’ may be replaced with the term ‘Mobile Station (MS)’, ‘MobileSubscriber Station (MSS)’, ‘mobile terminal’, etc.

Further, the UE may be, for example, a transmission UE, a reception UE,a wireless device, a wireless communication device, a vehicle, a vehicleequipped with a self-driving function, a connected car, an unmannedaerial vehicle (UAV), an artificial intelligence (AI) module, a robot,an AR device, a VR device, a mixed reality (MR) device, a hologramdevice, a public safety device, an MTC device, an IoT device, a medicaldevice, a FinTech device (or financial device), a security device, aweather/environmental device, a 5G service-related device, or a devicerelated to a 4^(th) industrial revolution field.

Further, the UE may be any of, for example, a cellular phone, a smartphone, a laptop computer, a digital broadcasting terminal, a personaldigital assistant (PDA), a portable multimedia player (PMP), anavigation system slate PC, a tablet PC, an ultrabook, and a wearabledevice (e.g., a smart watch, smart glasses, or a head mounted display(HMD)). The HMD may be, for example, a display device which may be wornaround the head. For example, the HMD may be used for VR, AR, or MR.

The UAV may be, for example, an unmanned aircraft which flies by awireless control signal. The VR device may include, for example, adevice that renders objects or a background of a virtual world. The ARdevice may include, for example, a device which connects an object orbackground in a virtual world to an object or background in a realworld. The MR device may include, for example, a device which merges anobject or background in a virtual world with an object or background ina real world. The hologram device may include, for example, a devicewhich renders 306-degree stereoscopic images by recording andreproducing stereoscopic information, relying on light interferenceoccurring when two laser beams meet. The public safety device includes,for example, a relay device or device wearable on a user's body. The MTCdevice and the IoT device may include, for example, a device which doesnot require human intervention or manipulation. For example, the MTCdevice and the IoT device may include a smart meter, a vending machine,a thermometer, a smart bulb, a door lock, or various sensors. Themedical device may include, for example, a device used for diagnosis,treatment, relief, or prevention of diseases. For example, the medicaldevice may be a device used for the purpose of diagnosing, treating,relieving, or correcting injury or impairment. For example, the medicaldevice may be a device used for the purpose of examining, replacing, ormodifying a structure or a function. For example, the medical device mayinclude a device for treatment, a surgery device, an (in vitro)diagnosis device, or a hearing aid. The security device may be, forexample, a device installed to avoid danger and maintain safety. Forexample, the security device may be a camera, a closed-circuittelevision (CCTV), a recorder, or a black box. The FinTech device maybe, for example, a device which may provide a financial service such asmobile payment. For example, the FinTech device may include a paymentdevice or a point of sales (PoS) terminal. The weather/environmentaldevice may be, for example, a device which monitors or predictsweather/an environment.

The embodiments of the present disclosure may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, the methods according to theembodiments of the present disclosure may be achieved by one or moreApplication Specific Integrated Circuits (ASICs), Digital SignalProcessors (DSPs), Digital Signal Processing Devices (DSPDs),Programmable Logic Devices (PLDs), Field Programmable Gate Arrays(FPGAs), processors, controllers, microcontrollers, microprocessors,etc.

In a firmware or software configuration, the embodiments of the presentdisclosure may be implemented in the form of a module, a procedure, afunction, etc. For example, software code may be stored in a memory unitand executed by a processor. The memory unit is located at the interioror exterior of the processor and may transmit and receive data to andfrom the processor via various known means.

Those skilled in the art will appreciate that the present disclosure maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent disclosure. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of thedisclosure should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

The present disclosure is applicable to UEs, eNBs or other apparatusesof a wireless mobile communication system.

1. (canceled)
 2. A method of transmitting control information by acommunication device in a wireless communication system, the methodcomprising: determining a first channel state information (CSI) reportwith a first highest priority among a plurality of CSI reports, whereinthe plurality of CSI reports corresponds to a plurality ofnon-overlapped Physical Uplink Control Channel (PUCCH) resources in asame time interval, wherein the first CSI report corresponds to a firstPUCCH resource among the plurality of non-overlapped PUCCH resources;determining a second CSI report with a second highest priority among theplurality of CSI reports, based on which format the first PUCCH resourcehaving, wherein the second CSI report corresponds to a second PUCCHresource among the plurality of non-overlapped PUCCH resources; andtransmitting the first CSI report and the second CSI report using thefirst PUCCH resource and the second PUCCH resource, respectively,wherein, based on (i) the first PUCCH resource having a first format,and (ii) one or more remaining PUCCH resources, other than the firstPUCCH resource among the plurality of non-overlapped PUCCH resources,having a second format: the second CSI report is determined as a CSIreport with a highest priority among CSI reports corresponding to theone or more remaining PUCCH resources having the second format, wherein,based on the first PUCCH resource having the second format: the secondCSI report is determined as a CSI report with a highest priority amongCSI reports corresponding to all remaining PUCCH resources, other thanthe first PUCCH resource, and wherein the first PUCCH resource of thefirst format has at least a first number of symbols, the second PUCCHresource of the second format has at most a second number of symbols,and the first number is greater than the second number.
 3. The methodaccording to claim 2, wherein the first PUCCH resource of the firstformat has at least four symbols, and wherein the second PUCCH resourceof the second format has one or two symbols.
 4. The method according toclaim 2, wherein the communication device includes a device configuredto operate in a self-driving vehicle.
 5. A communication deviceconfigured to operate in a wireless communication system, thecommunication device comprising: at least one processor; and at leastone computer memory operably connectable to the at least one processorand storing instructions that, when executed by the at least oneprocessor, perform operations comprising: determining a first channelstate information (CSI) report with a first highest priority among aplurality of CSI reports, wherein the plurality of CSI reportscorresponds to a plurality of non-overlapped Physical Uplink ControlChannel (PUCCH) resources in a same time interval, wherein the first CSIreport corresponds to a first PUCCH resource among the plurality ofnon-overlapped PUCCH resources; determining a second CSI report with asecond highest priority among the plurality of CSI reports, based onwhich format the first PUCCH resource having, wherein the second CSIreport corresponds to a second PUCCH resource among the plurality ofnon-overlapped PUCCH resources; and transmitting the first CSI reportand the second CSI report using the first PUCCH resource and the secondPUCCH resource, respectively, wherein, based on (i) the first PUCCHresource having a first format, and (ii) one or more remaining PUCCHresources, other than the first PUCCH resource among the plurality ofnon-overlapped PUCCH resources, having a second format: the second CSIreport is determined as a CSI report with a highest priority among CSIreports corresponding to the one or more remaining PUCCH resourceshaving the second format, wherein, based on the first PUCCH resourcehaving the second format: the second CSI report is determined as a CSIreport with a highest priority among CSI reports corresponding to allremaining PUCCH resources, other than the first PUCCH resource, andwherein the first PUCCH resource of the first format has at least afirst number of symbols, the second PUCCH resource of the second formathas at most a second number of symbols, and the first number is greaterthan the second number.
 6. The communication device according to claim5, wherein the first PUCCH resource of the first format has at leastfour symbols, and wherein the second PUCCH resource of the second formathas one or two symbols.
 7. The communication device according to claim5, wherein the communication device includes a device configured tooperate in a self-driving vehicle.
 8. A method of receiving controlinformation by a communication device in a wireless communicationsystem, the method comprising: determining a first channel stateinformation (CSI) report with a first highest priority among a pluralityof CSI reports, wherein the plurality of CSI reports corresponds to aplurality of non-overlapped Physical Uplink Control Channel (PUCCH)resources in a same time interval, wherein the first CSI reportcorresponds to a first PUCCH resource among the plurality ofnon-overlapped PUCCH resources; determining a second CSI report with asecond highest priority among the plurality of CSI reports, based onwhich format the first PUCCH resource having, wherein the second CSIreport corresponds to a second PUCCH resource among the plurality ofnon-overlapped PUCCH resources; and receiving the first CSI report andthe second CSI report using the first PUCCH resource and the secondPUCCH resource, respectively, wherein, based on (i) the first PUCCHresource having a first format, and (ii) one or more remaining PUCCHresources, other than the first PUCCH resource among the plurality ofnon-overlapped PUCCH resources, having a second format: the second CSIreport is determined as a CSI report with a highest priority among CSIreports corresponding to the one or more remaining PUCCH resourceshaving the second format, wherein, based on the first PUCCH resourcehaving the second format: the second CSI report is determined as a CSIreport with a highest priority among CSI reports corresponding to allremaining PUCCH resources, other than the first PUCCH resource, andwherein the first PUCCH resource of the first format has at least afirst number of symbols, the second PUCCH resource of the second formathas at most a second number of symbols, and the first number is greaterthan the second number.
 9. The method according to claim 8, wherein thefirst PUCCH resource of the first format has at least four symbols, andwherein the second PUCCH resource of the second format has one or twosymbols.
 10. The method according to claim 8, wherein the communicationdevice includes a device configured to operate in a self-drivingvehicle.
 11. A communication device used in a wireless communicationsystem, the communication device comprising: at least one processor; andat least one computer memory operably connectable to the at least oneprocessor and storing instructions that, when executed by the at leastone processor, perform operations comprising: determining a firstchannel state information (CSI) report with a first highest priorityamong a plurality of CSI reports, wherein the plurality of CSI reportscorresponds to a plurality of non-overlapped Physical Uplink ControlChannel (PUCCH) resources in a same time interval, wherein the first CSIreport corresponds to a first PUCCH resource among the plurality ofnon-overlapped PUCCH resources; determining a second CSI report with asecond highest priority among the plurality of CSI reports, based onwhich format the first PUCCH resource having, wherein the second CSIreport corresponds to a second PUCCH resource among the plurality ofnon-overlapped PUCCH resources; and receiving the first CSI report andthe second CSI report using the first PUCCH resource and the secondPUCCH resource, respectively, wherein, based on (i) the first PUCCHresource having a first format, and (ii) one or more remaining PUCCHresources, other than the first PUCCH resource among the plurality ofnon-overlapped PUCCH resources, having a second format: the second CSIreport is determined as a CSI report with a highest priority among CSIreports corresponding to the one or more remaining PUCCH resourceshaving the second format, wherein, based on the first PUCCH resourcehaving the second format: the second CSI report is determined as a CSIreport with a highest priority among CSI reports corresponding to allremaining PUCCH resources, other than the first PUCCH resource, andwherein the first PUCCH resource of the first format has at least afirst number of symbols, the second PUCCH resource of the second formathas at most a second number of symbols, and the first number is greaterthan the second number.
 12. The communication device according to claim11, wherein the first PUCCH resource of the first format has at leastfour symbols, and wherein the second PUCCH resource of the second formathas one or two symbols.
 13. The communication device according to claim11, wherein the communication device includes a device configured tooperate in a self-driving vehicle.